Perhaps. Occam’s Razor and all.
However, there’s something about the story line that doesn’t pass the smell test.
It seems odd that having killed his girlfriend in the heat of passion, the perp could come up with a chillingly perfect plan to commit mass murder and acquire the means to do so, all in a two hour period when the campus was ostensibly locked down.
No matter. This could happen at any school, anywhere, and there but for the grace of God go we.
News saying it was a student of the school that did the shooting. Not an outsider.
I don't think the statement implied that the shooter caught his ex-girlfriend in bed with another man THIS morning.