Sometimes they are wrong.
All my life, I have tended to assume that anyone else's opinion was more valid than mine. If I thought a problem should be solved one way and another person thought it should be done a different way, I usually deferred to them. It's a lack of confidence on my part.
But in many of these situations, I would watch in frustration as the project went wrong. Once I finally demanded we do things my way, the problem got solved. Not that this happens every time. I make my share of mistakes. But in hind sight, I make good decisions more often than I let on. As I get older, I'm beginning to trust myself more and even speak up when I see the better answer. If someone else has a better answer i'll happily use that, but if I know what I'm doing, it seems like a good idea to do things my way.
It's not that anyone has a monopoly on good sense. It's just that we have to trust in ourselves and be willing to speak up for the quality of our own thinking.
_________________
Never let the weeds get higher than the garden,
Always keep a sapphire in your mind.
(Tom Waits "Get Behind the Mule")