Except that an enforcement of a real-name policy will make it even easier to abuse online users, since now a harasser (or "troll", if you will) has that much more information to go on when doxxing or otherwise imposing offline consequences for online activities.

In other words, pseudonymity is, if anything, the one safeguard we have left against the sort of cyberbullying that happens with disturbing regularity. Advocating for its removal for the sake of "online safety" is the textbook definition of "backfire" (and, I'd imagine, would count as tragic irony).