I have a good friend who did just that. Started as an apartment maintenance guy after HS - now owns & manages millions of dollars of apts.
Incredible mind for buying depressed apt. bldgs. and turning them into highly profitable ones. Generally doubles the complex value and his money.
#1. Get rid of bad tenants, select only best tenants.
#2. Make complex highly desirable - EVEN if in an undesirable area! Make apts. the most premier in area fixing all deficiencies and adding items increasing desirability. Raise rents.
I’m not saying that he “snapped” because “snapped” implies an impulsive act, as opposed to a carefully planned action.
That being said, I propose that one of his major motivations, being the owner of real estate complexes with, I assume, tenants, is the loss of revenue due to ICE cracking down on illegals. If as evidence suggests, he’s a rabid lefty, he’d “snap” and take his revenge out on what he perceives to be Trump supporters. Interviews with his brother (especially watching the video done with the body language specialist) seems to suggest that the family is - dysfunctional at best.
That’s not to say there weren’t other possible factors, such as huge gambling losses, girlfriend dumping him, alcohol, etc.