If you click on one of the tags, it should in theory pull up all stories with that tag. It took great strength of will not to have about sixty of them and make them double as subject-descriptor tags when I figured that out.

Considering that the Big Two of rape and major character death are mandatory... offering the option of an "I don't warn" tag would be misleading, I think (in that I suspect people would start not using the two mandatory tags if they had that tag as an excuse not to).