He should at the very least ensure that there was some kind of liaison person at Meta for these not quite as rich (and certainly less obnoxious) Mark Zuckerbergs to reach in case of trouble with his service. This lawyer Mark should just have his account flagged with a huge 'Vetted, this guy is called that; leave it.' notice for any Meta algorithm or employee looking into it.

No. The individuals genuinely at fault here are

1) those who inflict harm on others, considering that being wealthy or disliked does not justify actions such as death threats

2) those who target the wrong person simply due to a shared name.

Any discussion of compensation should be directed at them.

Answer the question: What would an asshole do? They would buy up their neighbors' houses to make an unapproved mega compound, buy up ancestral Hawaiian land to block communal land access, and do unlicensed shit without permits making their remaining neighbors miserable. So what is right by virtue is unlikely to happen because almost all billionaires are legitimized criminal aristocrats subject to a different set of rules than average or poor people who are killed in the street for selling loose cigarettes like Eric Garner.