You're confusing the 12 times he was allegedly stalking 1122 King Rd with the night of the murders. Since LE never talked to BK before they arrested him, they never had the opportunity to ask him about the 12 times. However, him being at the library is actually a very realistic possibility for a grad student. Certainly I spent a lot of time at the library of a different university than the one I went to while in grad school and I know many others who did the same thing I did. So it's not like it is unusual.
All of this is allegedly and imoo
I think it is fine to contemplate BKs various travels and possible spots of interest he may have stopped and visited, all within reason, and with a basis that's within WS guidelines of not grasping at empty air. For instance, I've wondered if BK was scoring drugs in that specific area as we learned in the very beginning that the area was a known drug haven coupled with he's a former addict.
BK seemed to be on a self-fulling destiny. His professional life was tanking rapidly near the semester's end at UoW. We can connect dots to multiple events occurring in his professional life then to his possible reaction to those unpleasant, possibly traumatizing events that may have been anticipated by Bryan. Maybe he totally expected to fail, as his thoughts tightened into a penalizing, death spiral of penetrated fury. He would kill before departing the great state of Washington.
His life's career was surely ruined in Pullman. BK would no longer possess a prestigious job title at the University because he was fired nor would he obtain one with the Cops helping in data collection with whom he'd applied. I don't understand why he didn't adjust his attitude toward success. Instead, he chose evil. He took 4 lives, without permission, from the 1122 House so he could remember the painful ordeal that his education; nay, his life had been.
Disturbingly, if he purchased the KaBar in APR 2022, surely killing was on an evil mind at the time. He knew that even before attending UoW or why else take the KaBar to WA with him? He knew.
I don't know when or how he determined to target these beautiful people or that small 1122 House. It remains a mystery why there's 4 dead in Idaho. It's not a mystery that BK's been accused.