In some cases, SE moderation by the community is working too well... And when content gets deleted via system auto-response to flags, or power user editing/delete activity, we the mods never actually see it.
For example, @dopplegreener and @DaleM did a good job flagging and getting the system to auto-delete a recent super offensive post (the "best mind #uck for a woman" post, I'm sure it sticks in their minds) and left a comment saying we should probably look at the account responsible. But sadly, when that happens all the flags get auto cleaned up by the system, and I just ran across it today more than a week later by pure luck. Same with a recent very offensive/insulting comment - site users rightfully flagged it, it got deleted, we never found out till looking at deleted comments specifically on that post when doing other stuff.
So do feel free to @mention one or more mods in those situations, or do a custom flag on a nearby undeleted item, so that we can properly follow up, when it's something that rightfully might need more vigorous addressing (I have deleted the account responsible for the former hatefulness, for example).
You don't need to ping us for everything, but if it's something that you'd have every expectation a suspension or deletion would be issued for, and it looks like maybe offensive flags or the like got to it without it otherwise coming to anyone's attention.
Thanks, and I'm logging various meta.se feature requests to help with stuff like this, but in general that's a low percentage play, so do feel free to "if you saw something, say something."