Loneliness does explain it for a not-insignificant number of these types. It perpetuates itself. The more conspiratorial you get the more you alienate others. The more alienated you become the more lonely you get. The circle gets smaller and smaller. It's why I have a small degree of pity for the maga types. Not enough to stop me from mocking them or thinking that their relatives and friends deserve to cut them off for being toxic. But it's still kinda sad. That was somebody's parent or kid. A childhood friend. A trusted mentor or promising student.

Or you're the guy who draws Dilbert. The man is a cautionary tale at this point.