I'm not a "fu-fu lady", LOL, but I do like Michael's. I'm not overly "crafty", but if you have kids, it's an awesome place to get all the doodads and art supplies for them. They also sell some really cool hobby supplies that even "macho" crafters might like...I think someone mentioned rockets?
Personally, I think Michael's has nothing to do with it. It's a pretty common store - could just as easily be Home Depot (like tonight), Wal-Mart (which also has had its share of controversy), etc. If Michael's does figure into it, I'd say the sniper is targeting the average American and his/her lifestyle - gas stations, craft stores, home improvement stores, schools. Things "nice people" do.