Either you never interact with any polarising topic, or you have no idea the extent extremists are willing to go to just for the sake of fucking with a perceived enemy.
Obviously, but this info might extend to emails and such as well.
It's important to be aware that unlike reddit employees who are liable to their company and the law, some rando with a grudge isn't, and there's very little recourse if they choose to abuse their access.
It's not that it's intrinsically bad to do this, but it's something that should be clearly explained and signposted to the users.
ETA: Apparently account details are only on your "home instance", so pick your home instance well I guess.
A fellow liver of mythology I see! I use the watcher angels from the book of enoch.