I don’t think it’s an insult at all — and I’m not trying to insult you. As I said, I’m speaking in good faith.
People can have a lifetime of experience, but that doesn’t automatically mean they’re committed to truth. That was the root of your question, wasn’t it? If my hypothesis is right — that many people are more interested in being right than in being accurate — then building your views on theirs doesn’t help.
Not because they’re dumb or inexperienced, but because they’re reasoning from the wrong foundation.
I don’t know if you’re religious, but think about this: there are dozens of belief systems, each with sincere, intelligent people fully convinced they’re the ones who’ve got it right. At best, only one of them is right — more likely, none of them are. So is shared belief or deep conviction really a reliable path to truth?
I don't believe it is if you care to know what the truth is.