LogFAQs > #968380940

you can't fault Usopp
the ship was a gift from a girl he loved, and the only thing remaining of his hometown since his mom died, and a memory of her, he also did all the repairs on the ship. You can't fault him for being the closest to it. He was also feeling inadequate since he was nigh useless against Aokiji, got beaten up by the Franky family twice, and all the money stolen from him that they were gonna use to repair the ship. So he perceived Luffy saying they'll move on as a slight against him as well for discarding stuff no longer of use to him. That culminated in Usopp arguing with Luffy, and being told to leave the crew finally shattered him