I think theres a lot of resentment coming from younger generstions towards boomers especially in light of knowing how they grew up on easy mode and in homogenous societies not competing with third worlders for housing and wealth. The upcoming future will be interesting to watch. If anyone had shitty boomer parents i think you could empathize.
Notice, for instance, that ageism is an -ism that Leftists have very little problem with. Leftists often say ageist things such as that their immediate ancestors are delaying 'progress', need to hurry up and die off already, ruined the world, etc.
It's just a feature of the Leftist psyche. The past is always inferior to the future, the old is always inferior to the new. If you believe that, then you will always want to do typical Leftist things like destroying cultural artifacts and historical sites.
Likewise, the next generation of Leftists will have the same feelings about yours. Repeat until everyone is extinct or Leftism is, because there is no actual end to Leftism at which point the Leftist mind is truly satisfied. There are only temporary satisfactions that wear off.
Thus mental illness and/or drugs make far more sense. Many yids have mental illness. Have someone with borderline psychosis use a stimulant or 'upper' like cocaine or methamphetamines and it could push them over the edge into paranoid delusions and hallucinations. Even marijuana can push someone from borderline to symptomatic.
I'm sure that PET and fMRI scans would reveal all kinds of abnormal brain activity. Yid brains on drugs probably get up to all kinds of hilarious things. All of the wrong areas lit up, none of the right areas lit up, looking nothing at all like the superior brain of a healthy goy.
At that point, he probably thought that his parents were plotting to harm him (delusion), 'overheard' them plotting to harm him (hallucination), or something like that, and so he decided to strike first. In his own mind he's probably wholly justified and rational, acting reasonably on the basis of the 'facts'. Too bad that said 'facts' would be little more than the drug-addled delusions and hallucinations of an insane yid.