The user can ask, "How do I do X?" and the the community may settle on, "don't do X", or, "Why would anyone ever want to do X?", but those don't answer the question. Maybe the user has a good reason, maybe not, but they aren't the answer.
Like all ranking systems, each method has its own advantages and disadvantages.
If you mean the mods could change the ranking system, of course they can. But that would just trade one set of problems for another.
If you mean that they could change the "wrong" answers to more correct ones, then yes, they could. But that kind of defeats the purpose of community voting. And it is much more work for them.
How would they decide that one answer is better than another? If their own knowledge, then that is going to feel very arbitrary in many cases.