Was Tywin going to try and unite the 7 kingdoms against her? We know he was trying to get Dorne on his side. He could've played the "Her father was the Mad King, and she's just as bad" angle, to try and put everyone against her.…
we all know why he hates tyrion this so much but would thing be more different if she wasnt died during birth ? or at least in a couple of days later maybe.