There's nothing you can do, it's the way humans are and the way they will always be. They will defend their point till the end. Their team has to win. If you had magical powers and could snap your fingers to make every human currently on Earth be open to all opinions, and not be so emotionally invested in their side, then what about their kids? It will continue in future generations because it's just human genetics.

The problem you have is that you're getting stressed out by it rather than accept it for what it is.