I think protection is warranted to prevent significant abuse/misuse. While I don't know which number counts as "significant", I think we're just not there yet.
Just downvote + comment any inappropriate answer.
I believe this question should be protected. For not we have 3 answers with reputation 1 - one is just a random comment, one is making claims without giving sources, and one being balanced, but a bit uninformative. I'd rather avoid the mess of the first two types of answers by keeping the question protected.