While it’s obvious why the perp targeted our armed forces, it’s possible that his family’s assertion that he was depressed was also true. If someone spent a lot of time mulling over supposed wrongs and spiraled into a deep depression, they might well decide to take out their supposed oppressors before killing themselves (or, in this case, suicide by cop).
Radical islamism was doubtless a big factor here. To ignore it is silly.
What with the father reputedly being an abusive aggressor himself, as well as actually “Palestinian”, not likely. And there’s also that bit about “the perp” visiting Kuwait and Jordan before doing this.