Yeah that's what I mean. He wouldn't do it because he's afraid of the backlash, not because he thinks it's wrong.
ok you may be right about this
Here's something I read on the wiki:
Tywin claims, however, that he had never ordered the rape, and that Elia, by herself, had been nothing, stating that her death had been unnecesary. He claims that he most likely had neglected to mention her when giving orders to
Gregor Clegane, and that Clegane had killed her because he had not explicitly been told by Tywin to spare her.
[25] Elia's younger brother,
Oberyn, however, believes that Tywin had Elia and her children killed as revenge for the slight he suffered when Aerys II refused the marriage of his son and heir, Rhaegar, to his daughter,
Cersei, marrying Elia, whom Tywin had refused for his own heir, to Rhaegar instead.
[4]
So I suppose it's ambiguous, and no one who knew the truth remains alive.