Many of your posts, and not just in this thread, seem to be concerned about violence in the US. It makes it seem like you think the country is some version of Road Warriors. It's not. It's great - everywhere I've gone in the US has been nice. Just know that, like everywhere around the world, some of the big cities have poor populations where crime is elevated - the "inner city" as it were. That said, in Boston, for example, you can be in a slightly scary area, then drive 2 miles and be in a rich, "safe" area. And the chances of being involved in a violent crime are slim. Don't worry so much.