If you want to make good decisions, you need to be informed.

There are a lot of ways to get informed and one of the best is to find people that disagree with you. People who disagree with you possibly have been getting their information from sources different from yours. By finding people who disagree with you, you can tap into their analysis of these other sources.

People who disagree with you can also help you uncover errors in your reasoning and reveal your hidden motivations that cloud your judgement.