One thing I’ve been thinking about. Daenery’s has an army of foreigners. Westeros largely operated as a Euro-Centric culture. She’s invited the rapists right into the continent, a continent that’s been largely homogeneous for centuries.
I’m not sure if hatred of Cersei will trump fighting alongside people who don’t fight with any sense of honor (slicing the horse’s leg).
Given a choice between Cercei (who is ruthless towards enemies, but has little interest in doing bad things to the little people) and somebody letting in a barbarian army, I would favor Cercei.
I see a similarity of Kings Landing to America. The Dothraki are middle easterner muslims. The North might be Europe and the UK. The South might be the Hispanic and black countries with possibly some Asian influence.