Given the number of comments on this SO question: In C++, why should
new be used as little as possible?, I'm wondering if it should be protected. Do moderators, et al., appreciate flagging a question for 'Needs Moderator Attention' -> Other -> 'Please Protect Me!'?
Protecting a question would only prevent people with less than 10 reputation from posting new answers. This is typically done if a question is publicized on a popular site like Reddit or Hacker News and we want to protect it from getting swarmed with answers from people not familiar with how Stack Exchange works.
Occasionally we also protect an old question that gets new answers from new users trying to get some rep that duplicate existing answers.
If you think an argument is breaking out in comments, protecting the question won't fix it, but it may be worth flagging it for moderator attention and explaining that comments are going off-track. A moderator can step in to clean things up and, if needed, lock the question to prevent further argument. However, locking also disables voting on the question and its answers as well as posting new answers, so it's generally not done lightly.