Sometimes it happens that, on answering a question, I see that someone else has given a plainly wrong answer (in my opinion, of course) to the same question.
I have always refrained from down-voting that answer because it seemed to me to be rather bad practice to down-vote competing answers. Where there are competing answers I assumed it to be better to leave the voting to my peers, who in principle, would be more neutral.
But I am quite happy to up-vote competing answers I deem to be good.
So my question: Is it good practice to refrain from down-voting a competing answer to the same question?