I often stumble in to threads with entire comment chains deleted. I assume most people here have faced the same situation as well, either here or on reddit.
I'd like to see a move to locking comments rather than deleting them by default. That would mean no further replies to the comment or any other comment in that chain, no one being able to delete or edit their comments, no one being able to add or remove votes to a comment, etc.
I understand for particularly egregious comments removal is completely necessary (especially when it goes hand-in-hand with banning users), but a lot of times comments are deleted as a means to prevent long argumentative back-and-forth chains that spam and derail topics, as well as antagonize users.
In a lot of cases I feel like deleting the comment only further serves to hide what is unacceptable behaviour (even if that behaviour should be obvious), rather than setting an example for the userbase.