It's not harmful, just silly. There are N articles about star wars and M articles about africa. When N > M to a ridiculous level, I'm okay with pruning stuff. I've never made a single edit to wikipedia though. Looks like I'm encountering some nerd rage.
Pruning articles about Star Wars doesn't actually improve the number (or quality) of articles about Africa. Deleting Star Wars articles won't make the contributors suddenly interested in writing articles about Africa instead.
> Deleting Star Wars articles won't make the contributors suddenly interested in writing articles about Africa instead.
If anything, the opposite happens. Contributors first come for special interests. Once welcomed into the community, they will stick around and their contributions broaden in scope. Was the interest that sparked their involvement Elizabethan drama or Star Wars? Who cares.