Had a Gentile reject the holiness and uniqeness of the Land of Israel, and will support the destruction of Judea, Samaria and Jerusalem and
then the elimination of the only little Jewish state, I wouldn't try to change that Nazi's mind in the first place, just like I wouldn't be trying
to convince a Muslim, since they support the same thing.
I don't know how Jewish Americans think and what will convine them to support their country, so I cannot answer.