There is much amazement that Thor is not the only Avenger to advocate leniency for Loki, hoping that he can change. All of them do. All of them have their reasons, after hearing his story from Thor.
Bruce knows what it’s like to feel like a monster.
Tony knows how it feels to never measure up.
Steve knows the pain of losing your whole world.
Clint and Natasha both know the feeling of No Going Back.
All of them want to believe in redemption for Loki, because they want to believe that it’s not out of their reach either.
Submitted by Mangaluva