Ostracising people for who they voted for pushes them further and isolates them to echo chambers

I'd say they were already neck deep in an echo chamber to vote for a convicted felon and adjudicated rapist with one failed presidency under his belt who openly states that their family members who are liberals are a danger to our nation.

When you put them on the defensive the natural response is to clamp down on their views harder

That ship sailed a decade ago and MOUNTAINS of facts haven't swayed them back to reality.

Your mindset is one you should have had a decade ago. A lot has happened since then. These people are not still redeemable and no energy should be wasted on trying to redeem them, only beating them into submission.