I don’t think it’s a matter of sympathy. Caravaggio lived at that particular time and tried to deal with what he had been dealt with. Remember, he didn’t have the luxury of a personal psychologist. And he certainly wasn’t the only person who acted the way he did in that era or many other eras, for that matter.
You have to separate the person from the artist. You can’t deny his talent but many artists and, for that matter, professionals can be the best at what they do, but they may be miserable at managing their personal lives.