These are users flagging questions. Whether they are overzealous or not is a next question altogether. Moderators respond to flags not perfection. If 10 users flag a question as not constructive because of the new scope, then the moderators must listen to the community. The community at one time accepted these questions, now based on discussion in meta.stackoverflow.com , they don't. Communities change over time.
Also a flock of moderators cannot close a question. Ideally one. What you may have seen as a flock could be one of the following options
* 1 moderator (his/her vote is binding) * 1-4 users + 1 moderator (remember a moderator vote is binding) * 5 users
These users are ordinary community users not moderators. If their decision was wrong to close a question, it will be reopened by 5 other /regular/ users.
Additionally it would help to show these example questions that you feel were closed justly so that a /community/ user not a mod can tell you why it was closed or what chance it has to be opened.
So if you can reply with the question that was closed wrongly, maybe some of us /ordinary/ users can help you.
Otherwise I feel your accusations towards moderators are misdirected as most times these questions are closed by regular users just like you and me.