People aren't 100% good or evil.
Hitler was a vegetarian, loved his dog and was nice to his secretary. Is every vegetarian now also evil?
I'm pretty sure even a piece of shit like a KKK Grand Dragon loves his daughter/son very much just like nearly every other parent on this earth.
Well yes this is technically true, but only if viewed in isolation. The context is that Hitler was 100% evil, even if he had good and moral traits his immoral and bad ones outweigh it significantly.
For example, Hitler once said this (to be clear this is not 100% known to be exact - the original was never found and only known in the English translation of the text, but his feelings towards Muslims and Japanese/Chinese are well known):
"Pride in one's own race—and that does not imply contempt for other races—is also a normal and healthy sentiment. I have never regarded the Chinese or the Japanese as being inferior to ourselves. They belong to ancient civilisations, and I admit freely that their past history is superior to our own. They have the right to be proud of their past, just as we have the right to be proud of the civilisation to which we belong. Indeed, I believe the more steadfast the Chinese and the Japanese remain in their pride of race, the easier I shall find it to get on with them."
So Hitler wasn't a "total racist™" but he did still see many other races as inferior, but because he saw other races as equals, many Nazis like to point out how Hitler was just a realist and all that sort of nonsense.
Yes Hitler liked Islam, and also Arabs (although historically they are semitic people), and and he also saw the Chinese and Japanese as equals, and in isolation those make him seem not 100% evil, but his actions and views to other races and other issues completely outweigh those sort of sentiments. Hitler hated Jews, but he liked Muslims, but that doesn't change the fact that he hates Jews.
Yes some people aren't 100% evil, some average person today can have murdered someone before, realised their mistake, did time, sought forgiveness, and do good deeds after the fact and eventually came out as a better person, then yes this person is not 100% evil if they do good in life, but Hitler did way too much evil, he is 100% evil. There is a point you cross like genocide where there is no turning back. There are people today that were once neo-Nazis and antisemitic and they changed their lives around eventually and do good deeds like holocaust education, etc, so yes these sort of people aren't 100% evil, but Hitler never changed - he killed himself even because he was a coward.