Because it’s not really about the political party, it’s about who shares the same worldview as you. If I am a spiritual vegan, it highly unlikely that things will be easy living with or being married to a carnivorous hunter. Someone who is actively working towards dismantling systems of racism and sexism is not going to jive well with a person who doesn’t recognize or care about those things.

Being a good partner and having a good partner is already challenging enough, why bring more stress into a relationship?