As it happened, the murders occurred in a span of no more than about 15 minutes. Two young ladies were spared. Four individuals weren't.
IMO he didn't come to kill everybody.
I think K was incidental. He didn't expect her, certainly didn't expect her in the same room.
I think X and E were purely reactionary.
I think this was targeted.
The Elantra would eventually have done him in, but just think how swiftly and precisely he might've accomplished a single murder. In and out in minutes.
That might have been part of the thrill. The challenge of it. The stealth. The invasion. The power.
One murder. Little sound, no need to set the sheath down at all. In and out without a sound, the sleepers solidly undisturbed.
Planned but planned poorly. Forgot to factor for human dynamics. Other people skew the equation.
I'll bet he sped out of there talking to himself, narrating what just happened and spooling in his head whaddoido whaddoido whaddoido.
Probably showered for three straight hours.
All born of some rage-fueled, perceived-injustice-avenging, gross entitlement mission --
The same kind of ill-logic that results in an innocent person shoved off a train platform or school shootings or or or...
Tragic as this crime is, it's a credit to advances in DNA and CCTV, there's been an arrest and -- let's hope -- a conviction. Thirty years ago, he might've remained a free man, to kill again. No criminal mastermind. Just a criminal. Like them all.
It's devastating that these four beautiful souls are gone -- all that potential stolen.
JMO