A soft delete is about the only sane way to handle this kind of information, to be honest. People already used the delete feature for harassment, but imagine if there was no way to see the deletions on Reddits side, a report of the harassment would mean nothing.
Yes, the right to be forgotten exists, but it’s much more in depth to create an account, harass someone in comments so it reaches their notifications, then request a deletion of the account. Vs just deleting the comment and doing it again and again.