And reading the Kyoshi novels really puts that into perspective. Korra didn’t ruin Aang’s characterisation. It simply revealed the nature of the Avatar cycle. Even Yangchen created problems for the avatar that came after her.
Margot and Lara Jean spent her entire childhood trying to make it up to her. So of course they weren't going to reprimand her. Of course they weren't ever truly going to be mad at her for long.