Explanationpic.twitter.com/AHipUTX6Bt
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Maybe because he was mentally ill like his psychotic father. Mental illness never makes “sense.”
What explanations do you need? If you have designed to kill mass# of people ALL YOU LOOK FOR IS AN EXCUSS to use them. Its what killers do.
Possibly because he could?! Hey he has so many guns, so amped up, the temptation to use them to full effect might be the reason.
Maybe there is no rational. Really.
Please stop the useless speculations. All you do is add to the distracting noise. Motive doesn’t matter. Gun control does #Resist
He loos like political assassin who obviously radicalized.
The brother likes the spot lite. 


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