What's happening?

I'm sure it's not any different in the States and you all have just as much reason to be nervous or scared but right now I feel like all of Europe is on guard. Everywhere I go I'm supicious of the man with the large stuffed backpack and an sort of bag left lying around. I should be enjoying my last week in Paris and instead all I can think of is in order to get home on Sunday I have to ride muliple metro lines to the airport, then fly to London where I have a 2 hour layover and then a 10 hour flight home. And right now none of those methods of transportation strike me as very safe. From the multiple bombings in London, to Egypt, those on a daily basis in the Middle East, I really can't help but wonder where it's all headed. Though honestly I'm not sure I want the answer to that. I've resigned myself to the fact that I really can't read the paper because I just start to panic about my long trekk home.
Maybe I'm over-reacting and being dramatic, but I can't honestly say that I feel safe. And not that the U.S is any safer, but at least I'll be with the people I love.
Like the American man whose daughter was killed in Egypt said, I don't understand what's going on and why. I get the logistical crap and the politics as much as one can. But that doesn't explain to me the thoughts that provoked all that has passed. I know I'm not alone in these thoughts, but nonetheless I find them frustrating and horrifying.