Left-wingers think Russia is evil because they banned gay marriage so the west can easily craft a liberate the country from evil Christian oppression story and leftists will think they are the good guys.
If Biden tries to go to war with a bunch of right-wingers in the military, lots of guys will seriously question if Russia is even their enemy.
No, it is because they know left wing military will attack patriots/enforce unconstitutional "laws" inside the USA.