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is that they make it seem like the best course is to do nothingWhen "doing something" is worse than "doing nothing", then yes we should do nothing. Off the top of my head, the things we've done because of 9/11:
* Create DHS
* Begin TSA security theater
* Start illegal NSA metadata collection program
* Afghanistan + Iraq ("not related", but had support from misinformed public) wars.
A good thing I can think of: more secure cockpit doors. On balance, yeah, I wish we had done nothing after 9/11. On the other hand it's not impossible for good actions as a result, but we have a pretty bad track record of it.
The importance of putting the _actual_ consequences in perspective is to let you at least consider that maybe we don't have to do anything sometimes. It's like the 80/20 rule or anything with diminishing marginal returns: to actually achieve flat out 100% safety and security is going to be an extremely expensive endeavor both in monetary terms and in how our society and ideals have to change.