I've never 'got'

There are a lot of deranged people out there and if someone decides they want to do you harm due to something you posted online, no matter how innocent, it's best not to let them be able to connect it to your real life.

Deranged people, stalkers, abusers, and the society that produced them, are the problem that need addressing. It's a shame people are not safe to use their own names. Online aliases might make us feel safer but it doesn't solve the problem of abusive behaviour, any more than telling people they shouldn't put themselves at risk by going out at night. I guess I'm lucky to never have suffered serious online abuse.