fanatic xenophile would want to ban the trade of aliens.
this is quite a trumbling argument to be made.
xenophile are not egalitarian .
they like aliens, but this doesn't mean they considerate aliens as important as themself or anything .
in fact, a fanatic xenophile can be authoritarian and have slaves , why should they vote for banning slavery?
the only ethic that is actualy against slavery are egalitarians , no-one else should have a particolar desire to ban slavery as a concept.
and while i'm well aware that humanity has a strong value for egalitarianism , it is only towards other humans , we have no problem enslaving other races becuase they are " not intelligent" .
In fact , it could be argued that egalitarian only care about theyr own race if they do not have a xenophile ethic , so egalitarians themself should not be against slavery itself by default.
(edict : in fact, you can be an egalitarian xenophobe , that have no rights for xenos )
so, the only empires that should propose and support indipendently a proposal for the banning of organic slavery are egalitarian xenophiles .
all others should have a pragmatic aproach to it .