Ok. Personally I wouldn't consider that to be preventing emotions, but ignoring them. I think it is an undesirable thing precisely because you don't notice the emotions, but have them anyway, and they have consequences. Since you aren't paying attention, you can't do anything about those consequences.
I was talking about actually not having the emotions at all, as physical realities, which of course is not something that can be done 100% of the time.
What do LWers think about this concept? What do you think is the main rationale for this idea, and do you think it is a good policy?