Sad news across the pond

I just heard about the bombings in London. Hopefully all my friends and co-workers near London are ok. This type of thing doesn't make sense to me. "To each, his own." has always been my philosophy in life. If someone else has a different opinion... so be it. The world is too big and life is way too short to worry about what other people's beliefs that may be different from my own. I know it's not as simple as that but why can't it be?