My old one? It's a good question and I have actually thought about it. I have a lot of inanity on there but some (I think) decent replies to people trying to be "reasonable" fascists, racists, misogynists, etc. if that makes sense. I'll admit I mostly posted news articles I thought were interesting, though I would regularly participate in the discussions for those articles, but those articles frequently got a lot of traffic. So I guess there's two problems with nuking the account:

(1) If I delete all my comments, you end up in some cases with what looks like someone deleting their response to a bad actor, leaving that bad actor not only unchallenged, but looking like they "won" the argument, and

(2) If I delete all my posts, I remove from public view the comments of (at this point) likely tens of thousands of people, if not more given how many high karma and high participation posts I submitted, many of whom might not have wanted me to do so.

I have so many of both that it'd be a massive pain to go through and selectively delete stuff. Easier to just leave the account be and never use it again. Deleting the account just means it's anonymized, which can also invite bad faith.