Not much. Having lived many years abroad, my theory is that America appears to be such a wild and crazy place because we value everyone having a voice. People in America like to let others know of their opinion as freedom of speech is so celebrated here. You don't see shirts and stickers exposing lifestyles and opinions as often abroad, like "I'm the proud parent of an accelerated learner" or "I love God and Guns".

I bet there are people out there outside the US who think that you should protect your safety in a boring computer conference, but you won't ever hear about it. This notion is too fringe and people won't dare say it.