There's a user on wikipedia names "Byelf2007" who has made many edits to the Non-Aggression-Principle page, Voluntarism page, and possibly other related pages.

Many of his edits involve deleting valuable content, or changing content to the point it is so vague that it is useless - often claiming it has not been properly cited yet. Just about anyone involved in these philosophies understands nearly every basic principle he claims needs a citation, however his actions have diluted these pages into becoming moderately useless. I would think he could just add a "needs citation" tag, rather than deleting content with the justification that it needs citation, if he actually had good intentions.

I'm not that familiar with how the formalized Wikipedia edit process works, and I don't have time to keep track of the edits every day. Undoing every change that one user has made could be a lot of work. Is there any way this could possibly be handled? Am I just ignorant about how wikipedia works? Advice?