If you think negatively, a bad singer in choir will ruin the song.
If you think positively, even if that bad singer is the worst of all, the rest of the choir can join hands and sing together so that it will sound good.

PS. Everyone have their own thinking and principles. If I did any mistakes to make you upset or insult and object your thoughts on certain things or worst, say any harsh words, I apologise. Hence, while I am learning to respect your thinking and principles, please respect mine too. There are reasons why I chose it. If you get to know them or even step a foot to the place, I can assure you that there will be a change of mindset. Btw, I am not angry. :)