I don't think the point is about the citizens themselves, it's about how they normalize this kind of behavior by their police / government.
I don't agree with that kind of behavior either frankly, but it's a wonder the country is as safe as it is under constant threat. It's kind of a no-win situation for them. If they don't do that and are overcautious, they get attacked more. If they do, they get attacked for doing it.
I'm sorry for what happened to your Mexican friend and I hope he receives better treatment in the future.
That's a very nasty way of trivializing the use torture. http://www.haaretz.com/israel-news/.premium-1.757404
Methods like that do in no way help with any of the two sides getting closer to each other, they only serve to radicalize both sides even more.