+ and - rating system

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I have read some of the comments that others have written when someone makes a statement or ask a question and someone answers it, sometimes I find that the answers may not be a good one based on my knowledge in that area, for example, when someone ask a question regarding health issues, I know that I would have given maybe the same answer some years ago because I'm really trying to help that person and did not know that that would not be good, but over the years I've learned a lot about the laws of health that I did not know then but I know now, and within that same response I see good positive answers also, so I would not even consider giving a - (negative) rating for that comment or any other comment I may not agree with because it hurts that person trying their best to help. When rating another person we must remember that we are dealing with real people who are trying their best to help another person and even though we may not agree with the answer(s) given or the comment(s) made we should not be so quick to use the - (negative) rating and we should also put ourselves in that person's shoe and remember that we are an online family and should treat each other with respect and care. We could respond with "I disagree with that answer given because and give our reason for our disagreement instead," (just a thought and an example of how I would address the issue not trying to tell you what to do or how to respond.) What are your thoughts about the - (negative) and + (positive) ratings of someone else's comments, etc.