These attacks seems super coordinated. Disguises, pre-made bombs, a get away vehicle. Your typical crazy homegrown terrorist usually isn't this prepared.
Please, let's not talk about poverty, esp if you're from the US. You all are privileged in this aspect damn it. But again, this is way off topic and I won't bother to respond here to race related flamebait posts.
CORRECTION: A witness at Roberts Elementary reported a camouflaged middle-eastern man with a beard wearing a headset at the Waterman Discount Mall - possibly armed. /u/ctaggie