I think there are three main reasons CoSo has a left tilt.
1) the user base tilted slightly left and invited their friends.
2) current policies have those going right staying where they are because their right friends are there.
3) the ultra extremists tend to use troll tactics which a) aren't tolerated here b) used against like minded people.
This will change in time. Nothing that leans too far will last.
@Blue_Skyesr_here - it will. We tend to our own garden with loving hands.