A part of me was hoping that the perpetrators were home-grown. Not that I prefer domestic terrorism over international terrorism, but this just adds fuel to the xenophobia that has gripped a good chunk of America. When people automatically assume that a bombing was caused by a Muslim, I snarkily reply, "Just like the Oklahoma City bombing."
But it really sucks when that stereotype gets validated, because that makes things more difficult for peace-loving Muslims and people of Middle Eastern descent.
I'm not sure how true this is, but a friend posted about a man who assaulted a woman of Middle Eastern descent because of the Boston tragedy. These acts just fuel this asshole's behavior. I really hope that story isn't true, but I remember the irrational behavior of people following the 9/11 attacks.