A person can still retain their individuality within a group.
If there are only two parties, two teams, etc., you have to choose the one that comes closest to your beliefs. Choosing sides does not necessitate absolute obedience, nor concede your uniqueness.
When it comes to conformity, there will always be different levels of intensity. People are too complex.
There is little reward for doing what you're told. And there's more to gain from riding the sides.