(And only fairly recently have we really seen anyone use cars for terror attacks. And they are still fairly rare, considering how ubiquitous cars are.)
See also https://gwern.net/terrorism-is-not-about-terror and https://gwern.net/terrorism-is-not-effective
I think many people misunderstand the degree to which society is contingent on the good faith participation of most people.
It is like a prisoners dilemma where we have managed to convince 99.9% of people to cooperate and the whole thing can easily fall apart if they dont.
That should give people who want to impose their will on others more pause than it does.
Sure, but if you are willing to give your life 'to the cause', cars work.