Indeed, it shouldn't be necessary to say anything. To be a safe fulfiller of a wish, a genie must share the same values that led you to make the wish. Otherwise the genie may not choose a path through time which leads to the destination you had in mind, or it may fail to exclude horrible side effects that would lead you to not even consider a plan in the first place.

No, the genie need not share the values. If it only needs to want to give you what you would are really wishing for, ie what you would give yourslef if you had its powers. It can do that by discovering your value structure and running a simulation. It doesn't have to hold to your values itself.

This also applies to real-world examples. I can play along with values I don't hold myself, as people do when they travel to other countries with differnt cultures.