Why is the media listing a possible anti-semitic motive? Because there is an actual basis or more simply the school has a decent Jewish population and there is nothing else to do but speculate and make people scared so they will watch more news?
From what I just read she originally attended NYU and I guess that is where these 2 people originally met. I guess the girl complained about this guy a year or so ago.
I would think the anti-semetic stuff probably comes from stuff they may have found at his place etc.
My guess is this guy probably has a mental issue. And it has probably gotten progressively worse over the years. He was probably obsessing over this girl and perhaps in his delusions "the jews" slipped in to his paranoia
There are 2 pictures on CNN of him. 1) he looks kind of clean cut. 2) the surveillance video shows a Una-Bomber looking like guy.