I want to emphasize again that I am only writing about my own emotional reactions to threads being deleted without knowing why or . being informed, not about the decisions by the mods and admins to do that, which is something we all accept as a condition to participate here.
I have been/am on several different forums as I imagine many others are as well. It also happens sometimes on these other forums that threads or individual posts might be deleted but I find it bothers me less as I am usually reasonably clear in my own mind about why that might have happened, like for example soliciting donations, whereas oftentimes I am left wondering if I participated in a deleted thread here, how and if I contributed to it being deleted.
I am also sometimes very cautious about responding to certain threads to avoid being drawn into certain types of conflict or disagreement.
After a thread i have been participating in is removed I become more cautious about my posts and edit out a lot of what i might otherwise say because of my emotional reaction.