likeable, forgivable and trustworthy?

Deliberate cruelty is not forgivable!

But some things are not forgivable.

As the world s largest polluter, accounting for roughly a quarter of global carbon emissions, America s reluctance to do more is perhaps understandable, if not forgivable.

No but I think that the Loki horns is forgivable and if you really wanna nitpick in a comic nerd way, from the very first Avengers comic, Loki is the bad guy that they, he's the one that brings the team together in the first place.