"I used to think that scientists were impartial "

I've never held that view. However, I've always believed - and still do - that good scientists do try to put their personal feelings on the back burner, but none of us fails to be influenced by the world around us. We do not cease to be human beings when we go about our jobs and daily lives. The fact that we are imperfect is no reason to throw out the attempt at integrity.

To move it to a different realm -
Just because some catholic priests rape children, doesn't mean they all do.

Just because Jimmy Swaggert and Jim Baker had affairs doesn't mean that faithfulness is not a virtue.