I think sure reasoned arguments on both sides against each other are safe, though Chick and Vorbis type incendiary (well, that can be anything that impugns Rome to certain RCS) screeds should be avoided, and should be a less common occurrence.
I would nominate Springfield Reformer and MadDawg as the most civil posters on both sides, not that those with more heat are to be second class, while mere smoke is to be avoided.
I agree with your two civil posters and would add lee n. Field and mrs don-o to it. One man’s opinion.