No, nobody's trying to argue that gambling is by definition bad – that is to say, nobody's defining the category boundaries of "gambling" contingent on possessing the property "is bad". Some people have constrained the definition of "gambling" such that it only contains things they view as bad, and then observed that all the things they consider "gambling" are bad, but that's not the vacuous, circular claim you make it out to be.
In lieu of re-quoting other parts of the thread, I'll instead ask you to please re-read the arguments people have made, more slowly.
Reread your own message.
> Some people have constrained the definition of "gambling" such that it only contains things they view as bad
If there is some internally consistent definition that excludes all the “good” stuff without excluding it specifically for being good, no one has shared that so far as I’ve seen.
The arguments about insurance so far have been “but it’s a good thing” and “you aren’t happy when your insurance pays out”. The former is exactly gambling==bad and the latter is just wrong. I could bet that a politician I despise will win and I won’t necessarily be happy that I won. I’ll be more happy that I got a payout than not, exactly the same as insurance. That’s what a hedge is.
Insurances are not hedges. Hedges are „investment position[s] intended to offset potential losses or gains that may be incurred by a companion investment“ (wikipedia) of which insurances can be a part of, while in an insurance „a party agrees to compensate another party in the event of a certain loss, damage, or injury“ (wikipedia).
Absolutely not the same thing. But even so there is still an interesting insight to be gained from common parlance:
Usually we talk of a bet in a situation where you take an event that is somewhat out of your control and irrelevant for your wellbeing and intentionally and actively make some kind of material outcome for yourself depend on it. In so far speculation at stock markets is „gambly“, you are right about that. And if you have measures in place that hedge the risks of those speculations you might be tempted to very loosely call those your insurance.
If you look however at how the term insurance is typically used you can see a difference there: you insure against risks that are non-avoidable risks of your daily life or business. You do not intentionally and actively enter the cancer-lottery. And you do not actively take measures to win your „health-insurance-bet“ because the outcome is still considered catastrophic, even in case of „winning“ it.
And the way people tend to see things more as insurance vs. bets follows exactly these lines: is it about mitigating a devastating natural risk that is hard or impossible to avoid 100% or is it about something where you actively and intentionally attach your wellbeing to a random event. (We could separate this out in two questions: do you involve yourself actively and intentionally; and: is the outcome that you bet on inherently against your intrinsic interests. But that is a detail that I don‘t think we need to go into)
I think this explains the common parlance quite well: health-insurance: the risk is unavoidable, you do not willfully enter some kind of cancer-lottery on whose outcome you bet. Also you have an intrinsic interest in not „winning“ said „cancer-lottery“. -> no doubt it is insurance.
Legal expenses insurance: risks depend largely on your behaviour but you usually still have an intrinsic interest not having to use it. -> some people might see this as more gambling- or “bet-“ adjacent.
Speculating on one stock and hedging that bet. -> Totally not an insurance. Also not something insurances do. An insurance might be part of your hedge (maybe insurance of freight against loss) but insurers typically do not insure bets. Which makes sense, since part of their business-model is that the customer has an intrinsic interest that the payout case does not occur.
This whole thread started because someone essentially said “gambling is bad” and someone else said “not all gambling is bad; how about X, Y, and Z?” My point here is that if you sit down and define what gambling is in a principled and consistent way, you probably have to conclude that some good things are actually gambling. And that’s cool, because we can also then discuss what kinds of things that “maybe look like gambling” are actually a net positive vs net negative based on their impact rather than some division of “gambling” vs “not gambling” that is fairly arbitrary and leads to bias in how we think of them. You can’t have that kind of conversation if the definition of gambling includes “and it’s bad” because it’s tautological.
In specific response to your reply, I understand what you’re going for but you’re stretching definitions to meet your goals. The Wikipedia page you cite states clearly that insurance is a common hedge. And in your definition of a bet you state that it is “irrelevant for your wellbeing” as if a boxer wagers on their own fight wouldn’t be betting or gambling.
Your discussion of insurance vs bets is reasonable and I get what you’re going for, but I think the distinction is not as clear as it might seem at first. “I don’t want this payout” feels like a meaningful distinction but that Wikipedia page rears its ugly head and points out Hawking’s what-if-black-holes-aren’t-real bet that he wanted to lose. I wanted the Seahawks to win today. If I had put $50 on the Buccaneers would that have been a bet? Insurance? A hedge?
Regardless, back to my point. Maybe there is some criteria that disambiguates all the “good Things that look like gambling but aren’t” from the “bad things that are clearly gambling” but I haven’t seen it yet. I think it’s all some level of gambling. If I roll through life without health insurance, I’m betting I don’t need it. If I buy the insurance I’m betting that at some point I will, or at least that the odds are good enough that I will that I should hedge.