Whether it's silly or not depends on the facts. I think you're making a blanket assumption that reality falls about in the middle of the two, or leans slightly one way. That assumption might work out OK as a rule of thumb, but there's no need for a rule of thumb when you can actually look at the facts to determine who is right and who is wrong. Rules of thumb only make sense when information is limited. In a given case, the truth could turn out to be in the middle, a little toward one side, or much closer to one side than the other. I'll grant you that given the sheer number of points of disagreement that it's highly unlikely that one side is right all the time, but other than that I don't think any assumptions are in order. You just have to look at it issue by issue and figure it out. I'll just leave it at that.