The root problem is that we still don't know how to disagree when two sides look at the same set of data and believe two different things. We allow ourselves to descend into tribalism and assume the worst of each other.
If you look at the language Tom objects to the most, it's language Isaac uses that promotes this tribal attitude that the other side doesn't have your best interests at heart, and questions their motives.
We're just terrible at this, and I'm not sure any human society has ever really cracked it.