I guess you might object to these too:
* Marlon Brando playing Vito? Brando is of Irish descent. And regarding political activism, remember when Brando sent a Native American to refuse his Godfather Oscar? What about Brando's anti-semetic statements, for which he later apologized?
* Al Pacino playing Scarface? (where Robert Loggio is Lopez, Murray Abraham is Omar Suarez) or in Carlito's Way? Does that Pacino is not hispanic take away from these films?
* DeNiro playing Young Vito? DeNiro is Irish-Italian - more Irish than Italian.
What about Charlton Heston playing Moses? Heston is not Jewish. Or just about any western in which someone played an Indian or Mexican (i.e. Eli Wallach - Don Altobello in GF3 - playing Ugly Mexican Tuco in "The Good, the Bad and the Ugly").