I took a brief vacation earlier this month, a chance to drive from L.A. to Las Vegas, visiting my alma mater on the way. In Las Vegas, I spent an afternoon at the new Mob Museum. It’s better than I expected. But why are Americans so interested in museums devoted to violence, aggression and death? In this weekend’s tranche of stories I wrote about the museum, and a very good exhibition at the National Museum of Women in the Arts, devoted to art by French women painters from 1750 t0 1850.