Idk what's wrong with Sanji telling Jinbe to off himself.
Jinbe was so retarded that he released Arlong from prison with:
- no way of tracking him
- no way of controlling him
- no way of getting info about him
- no way of preventing him from hurting others
And that's after Arlong told Jinbe that he will enslave humans and left. He in all those years could not have bothered to visit Arlong himself.
Jinbe
should kill himself after that
But what's worse is that Sanji had to step in because Nami was so shit she could not have confronted Jinbe himself.
At this point I'm not gonna be surprised if Nami forgives Arlong.