The enemy of my enemy is my friend. The problem comes after you’ve defeated the original enemy as you have so aptly pointed out.
If I may use another trite saying, “Divide and Conquer”. Actually it’s not trite, it’s very effective. None of these agenda driven -ist folks have anyone real interest in mind. As long as they can keep us at each others throats, they can easily control and consolidate their own power. Dictator have used this dichotomy for eons.
It’s amazing that you are seeing this.