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I know some of you may think that sokka's trauma is pretty much as katara's, but they are actually very different
Obviously his mother dying was a very difficult and emotional time in his life, but sokka's real trauma comes from events that happened after his father lefts, he was very close with his father
And katara is a very strong emotional support system for him, he had the emotional support that he needed
But he knows katara didnt have one, he knows how close katara was with her mother and he knows that at a young age katara had to see things that she wouldnt have to
He knows that katara's pain surrounding events is deeper than his and he hates theres nothing that he can do about it, as hard it is to suffer is even harder watch someone you love suffer and not beeing able to help them
Thats why he is so protective with katara, he knows that he cant take away her pain but he is determinated to make sure she doesnt feel any more
We also knows that he sees kataras face when he pictures his mom, sokka beeing protective with katara is almost beeing protective with his mom
We see him beeing protective with most of the people during the show and i think that comes from the fact that he couldnt protect his sister from all the trauma that started that day
