In addition to the above, I think I read somewhere that he was viewed in the vicinity of the high school that morning, but drove off when there was police activity near it.
He went for the softest target.
The local police have stated repeatedly that the rumor he was seen at the HS has no foundation in fact.
My impression is that evidence from the shooter’s home indicates the elementary school was the original and intended target.
I definitely read that here on FR, and that there was security cam video from the H.S. that showed this.
I really want to see this video. If it exists, we really need to hammer this point to help get rid of the idiocy of gun-free victim zones.