[matheusmoreira]

It's not bitterness, it's anger. It can be a rather enjoyable and cathartic emotion, especially when one is confronting perceived wrongs.

Another benefit of sharing experiences, especially negative ones: it can help others. Maybe there are people on this site who aren't yet aware that stack exchange embraced deletionism. I certainly wasn't, wouldn't have contributed otherwise. If I help even one person realize this, it was worth it. That realization could prevent them from having their work closed down and deleted before they had even finished writing it.