Likewise, I tend to give the other person the benefit of the doubt, and when one party accepts the possibility that they might be wrong while the other party professes ironclad certainty that they're right, the argument almost always goes to the latter.
These days I temper my "I'm not certain so we should investigate this" with "but you're not certain either so you're not getting out of investigating it and admitting you're wrong if it comes to that."
These days I temper my "I'm not certain so we should investigate this" with "but you're not certain either so you're not getting out of investigating it and admitting you're wrong if it comes to that."