SBF: yah, but from hitlers perspective the jews were evil and he did the world a lot of good by gassing so many of them. You wrote the most important part is which perspective is useful, and that perspective was certainly useful to him.
So is the most important part of hitlers perspective if it was true or useful? I mean its either or.
you are the one who advocate there is not a "true" perspective wrt. the earth; but when it suit you you change vocabulary and insist there is a true perspective wrt. hitler (which just happens to be yours)
its getting really old...