just because this is a make believe world that is literally upside down and it has giant magic monsters doesn't mean most basic things about human psychology stop being prevalent.
Little kids picking fights with grown ups over trivial things is not normal.
You seem like you are about to go well out of your way to defend the actions of Eren and basically disregard the notion that he has been, and always will be, a violent nutcase.
If you want to defend his actions under the guise of him doing what he has to do to win his war then whatever.
but don't think he's a well rounded and upstanding individual with glowing personality traits. He's not.