By unfriending the other side you simply keep both sides polarized. And it's an upward cycle, or downward if you prefer. Polarization leads to more polarization.
As human beings we live very long lives filled with significant experiences. Some smack us in the face, and some slowly creep up on us, and they all change our world view radically. But that inner change, whatever form it takes, can easily be held back.
It can be held back by shame, uncertainty, disapproval, etc. When someone knows that their close ones will disapprove of their opinion they will be more likely to hold back on it. When your circle of influence becomes an echo chamber due to polarization you will be less and less likely to deviate from it even when these life experiences are pulling and pushing on you to change.
But if your friends are open, un-demeaning, and respectful, you don't hold back on changing who you are(which inevitably happens in all our lives) because there is no shame.
Since we inevitably share multiple public arenas with our fellow human beings I'd rather make it one that is open so that opinions and points of view are free to change and blossom. Again, all of us change, but many times we prevent it because our environments are too critical.







