> The one thing I never understood about these warnings is how they don't run afoul of libel laws. They are directly calling you a scammer and "attacker"
Being wrong doesn't count as libel.
If a company has a detection tool, makes reasonable efforts to make sure it is accurate, and isn't being malicious, you'll have a hard time making a libel case
There is a truth defence to libel in the USA but there is no good faith defence. Think about it like a traffic accident, you may not have intended to drive into the other car but you still caused damage. Just because you meant well doesn't absolve you from paying for the damages.