[pjackson]

Touchy topics, to be sure. I think they all can and should be asked. Whether each is really worth of much debate is a different question.

Most are worth debating, some aren't: depending on your audience. I think most people think these are things you "can't ask" because many folks lack an intelligent, informed opinion on the topic, and therefore resort to emotional closed-minded positions that result in little exchange of ideas.

So, intelligent people think: "Maybe I can't ask that question."