Depends. I really don't care what people think of me, but warnings don't have much of an affect on me (of course I won't post the same thing I was warned for).
Probably would rather have a post in the thread.
Edit: If I had cared about my member title like I did on my older account, I would much, much rather have a post in the thread.
Warnings affect member titles, so there are going to be a lot of people who would rather see a post in the violating thread.
[Edited on 09.11.2012 10:24 PM PDT]