You all need to read that kids manifesto, he certainly leaves no grey areas as to his reasons and intent. His choice of weapon, location, etc. He's psychopath who was influenced by specific people (who names) on the 'net:
"Won’t your attack result in calls for the removal of gun rights in the United States?
Yes, that is the plan all along, you said you would fight to protect your rights and the
constitution, soon will come the time"
https://emilkirkegaard.dk/en/wp-cont...-manifesto.pdf
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