They allied themselves with the only member of the grupo who DIDNT share the same beliefs aka sanji.
The following arc was about an isolated country dominated by a group who destroyed the environment in order to produce and sell weapons.
Not to mention the focus on gender given on kiku and yamato even though i disagree with that.
Fishman island was about racism.
Sabaody with slavery and human traffic backed by economic elite.
Oda has a literal che Guevara post on his room, c'mon lol.