@hawkeye10,
So, let's see if I have this right. The use of the NSFW tag makes you uncomfortable, as does the collective use of thumbs down by people to show displeasure, disagreement or indifference to a post. Because of this discomfort, you don't want to see it used.
Aren't they expressing their own version of truth telling that you say you so eagerly seek? Should your discomfort with their choice of expression be enough to cause the removal of the voluntary option each of us has the choice of using or not using?