We can say (and most of us would agree) that the Nazi ideology is abhorrent. Bad for the world. It caused suffering and death for millions of human beings. But most of us have no hatred toward Oscar Schindler, even though he was a member of the Nazi party. He wasn't a good Nazi — that is, he didn't adhere to the ideology — but he was a good human being.
In the same way, we can abhor the ideology of Islam (which has caused far more suffering and death than Nazism has), without hating someone just because he calls himself a Muslim. He may be Muslim in name only, not adhering to the ideology. We don't know. What we know for sure is that the ideology itself is dangerous for the world.
What do you think? Would that clarify it for those who don't yet understand?