This logic is how we ended up with TSA.
"What do you mean, people used to just walk up to planes with their shoes on and a FULL 8-ounce water bottle in hand with barely any physical security?"
It's easier to stop incentivizing people to ruin the commons, vs. trying to strengthen the commons against all possible adversarial behavior.
We ended up with locked cockpits that the pilots won't open for anybody, plus passengers willing to fight back due to the tragedy of the terrorists. We ended up with the TSA because Karen needed security theatre and the government was all too happy to increase the funding and scope of DHS with the nod of the useful idiots.