The suspect is believed to be Robert Card, a 20-year US Army veteran from Bowdoin Center, Maine.
(according to Telegrams so take with grain of salt)
EDIT: Name confirmed by news.
According to law enforcement, CARD recently reported mental health issues to include hearing voices and threats to shoot up the National Guard Base in Saco, ME.
Come now, it happens all the time anyway, which I think could be used for making a more useful analysis than this conspiracy shit. Making an environment where this happens all the time means there will always be a new atrocity to distract from ongoing popular movements and make any left wing opposition to the dems look bad as though the dems are doing shit about this anyway.