No single viewpoint has a monopoly on truth. We are all creatures of perception, of bias, of prejudice. It is so, so, easy to see in others, but to see in ourselves - well, it's like trying to see oxygen, or asking a fish to see the water.
I think that it easier than ever before, to live in an echo chamber, a sealed bubble, of voices and opinions that reflect, and reinforce our own, to refuse to engage, and avoid engaging, with those we find problematic and repugnant.
All too often, we want tolerance, we want understanding, and we want acceptance, and agreement, but we sure as hell don't want to give it. And why should we? After all, we are right. If they would only see.
And of course, we can always point to the outliers, the extremists, on the other 'side', to make our point, to reinforce our demonisation of those that exist in opposition to our own moral rectitude and shining superiority.