They are not rewarding the "bad answers". They are rewarding the effort. By your objectified "bad answers" you can mean three things I suppose.
First one would be, you are talking about grammatical errors. Now steem or musing is not a closed community for english speakers. You can find more then 50 different communities with different first tongue. Now if the non english speakers find a question which they have answer to, should they not help out just because english doesn't come easy to them? If you mean that then it woulld be a passive aggressive racism. I hope you don't mean that. But if you do so then musing is not a place for you.
Secondly, I think you are talking about the short answers.. Now if some one can get the words through in one sentence then what's the hold up? if you can do so too then do it. But if you are talking about the short ones then its not one musing, its one you as you are showing the symptoms of jealousy.
Thirdly it could be the actual bad irrelevant ones. I never saw musing upvote a question that's irrelevant. You can explore other users profile but you will not find upvotes on those answers. If you manage to find so then its just an honest mistake.
Hope you understood what I expressed. If I was able to get through to you then you are welcome.