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maybe this IS a case of somebody just going batshit...but if so, we need some answers.

Unverified at this point, but Marilou's ex Geary is supposedly a BernieBro; BernieBros were behind the Scalise shooting and a second which never really made the news.

If that is the case he probably has a history of psychotropic drug use, anti depressants, SSRI.
Bill Cooper stated in his book "Behold a pale horse" that the CIA had a operation named Orion. The goal of the program was to cause mass casualty shootings to change how the public thought about firearms to eventually remove the second amendment.
He said they used Prozac and electromagnetic frequencies to trigger someone to want to cause mayhem. Since then other drugs have been invented and used.

a history of psychotropic drug use, anti depressants, SSRI.

this would be an angle to look at; while he has no arrest record, maybe some might dig up medical records and see if there is any linkage