"They killed their best friend" indeed.
Get some facts right.
1) his sister? His paternal AUNT was deceased. The man she married was in Mosul. Do you know when he went back? I don't.
2)I went to Michigan and bailed out. I'm a young idiot. Some of us who don't have a sense of purpose or wanderlust or some other joy often bail out and move on. Some of us do it over and over.
3)As I explained earlier, I moved from the DC area just before 9/11. My mother has seen Middle Eastern men on a plane, a year before I think. What if one of them had used her password to send an email? Would I then be a terrorist?
4)Again, no sister at all in IRaq. Only his uncle-in-law.