I don't disagree with this. WikiProject Chicago being one I've had encounters with, and I understand that geographic WikiProjects are especially prone to this. WP Chicago has laid claim to every player that's ever played with a Chicago sports team, every model of railroad locomotive ever operated by Metra, and many other categories of very remotely related article. (note that I'm not suggesting that WP Chicago is necessarily the worst here; simply it's one that I've run into).
I remember WikiProject Texas tagging an article on a TV character who happened to be from Texas (only mentioned in a handful of episodes, never a significant storyline). I very much doubt they had any intention of editing the article.