Not to get all anarchist about it (blatant lies) but I really think a huge part of the conflict between Luffy and Usopp in Water Seven comes down to Luffy feeling the pressure to take a position of authority over the crew, rather than just leadership
The Merry was technically Luffy's ship, since Kaya gave her to Luffy, but it's undeniable that she was a home and a crewmate to all of the crewmembers and had a particularly close bond with Usopp, and even though it was the right decision, Luffy had no right to make that call on his own. And to be fair I don't think he would have under normal circumstances. Luffy doesn't want to be some kind of a big boss to his crew, he wants to be friends, but basically everything went wrong in Water Seven and he felt like it was his responsibility to take charge, and then he fucked it up
The fact that the situation was resolved by forcing Usopp to show submission in order to be accepted back does not help the case. It always feels gross to me
This is my biggest problem with Water Seven. Luffy and Usopp both fucked up, but only Usopp has to apologise, and in fact the narrative reinforces that Luffy has to stay adamant about it even though he clearly doesn't want to and it goes against his nature. The narrative sides with Zoro, but in my opinion Zoro is just wrong
The Straw Hat crew works so well because they're so good at sharing responsibility and leadership and listening to each other and being primarily comrades. The crew regularly criticises and confronts and straight up overrules Luffy when he's being a dumbass, and he accepts that because he respects them, and because being a captain doesn't mean authority to him; it's a leadership of purpose