I don't know what thread you are referring to. I didn't kill any today.
But aside from that, trying to read all the threads on here just for enjoyment is quite time consuming. Add to it the various hidden things mods do to try and enforce the admin's rules and keep things running smooth and you've got a big chunk of our time being spent here as volunteers, which is on top of our actual real-life commitments. Honestly, I do not have 10 seconds or the inclination to PM every person whose thread I might delete. And, the reasons for deletion are few. Primarily, politics, religion, or a shitstorm of insults and bad behavior are the reasons why most deleted threads are deleted. So, there should be little doubt about why one disappeared.
But again, I don't know what thread you are talking about, so this is all general.