Well, jarbabyj, you do live in Chicago. Lots of rails around there to be ridden out on. 
I’ve noticed that many of those threads seem to start as you said, with “Huzzah for dead McVeighs!” They then, and only then degenerate into death penalty discussions. Why are there so many threads lauding his execution? I don’t know. But I do know I’m much more liable to agree with you if those are the threads you’re talking about.
But, right now, in GD, there are three threads to do with the Mc-ster, and they all seem to be distinct and relevant:
- Heaven of hell for Tim: Ties execution and repentence in with enternal Judeo-Christian ideas about the afterlife
- Why Tim McVeigh’s execution was wrong: Pretty self-explanatory, and one of the main issues people are discussing
- Stoid’s death penalty stewing thread: Regarding whether the DP is satisfying or not
If you’re referring to MPSIMS, though, geez. You might as well hope to have stopped the proliferation of “All your base are belong to us” threads. No offense to anyone, but MPSIMS by its very nature is for discussions on a lower intellectual level than elsewhere. Is it surprising that people don’t seem to bother to do searches on a topic? Repeat threads seem to be one of the names of the game over there. Complaining about inconsiderate and unthinking behavior in MPSIMS is like complaining about the same type of behavior at a middle school dance.