Wasn't there a phrase "every time a Targ is born the gods flip a coin"?    Danny isn't mad, but her brother definitely was. Then you look at the children of Cersei for another mixed bag.    Danny's actions caused a lot of suffering and death, but her actions and thoughts were rational and she really did try to to good. It's hard to hate her too much for seeing people get massacred and in chains and want to radically end that shit.    GRM writes about incest because incest was hella common in royalty. Keeping "it" in the family where "it" is the money and land and power. Most of the incest that goes on in-universe is because of that. Or whatever magic is in the blood, like with Caster.