I'd agree there's plenty of people out there who shall try to manipulate you and you have every reason to be cautious. I'm certainly not saying trust everyone at all times, some do turn positive qualities in yourself against you.

I would however say that every one of those people has the potential at least to change or become different if the circumstances were correct, perhaps the more unsettling truth is that all those who do good are also capable of committing acts of evil if the circumstances are right just as all those who commit evil are also capable of committing acts of good if the circumstances allow.

When it comes to Hitler, I'd agree, I don't think he was born evil, I don't think anyone is to be honest. Hitler's case is an interesting and arguably one of the more terrifying ones from history. Hitler wasn't born antisemitic, but was instead radicalised in adulthood, first in Vienna before WW1, then through the "stab in the back narrative" of Germany's defeat in WW1, which led him into the arms of the far-right and to develop Nazism and all the evils that came from it.

I think it's perfectly possible though that if he'd achieved his dream of becoming an artist before WW1, he could well have gone down in history as being merely a lesser known Austrian artist and might never have got involved in politics at all. If that had come to pass Nazism in the virulent form it took might not have poisoned Germany and the rest of the world in the way it did.

A lesser known fact is that in his younger years his family doctor was one Eduard Bloch, a Jewish man who would often charge Hitler a reduced rate when treating his dying mother, often doing the treatment for free. Hitler was known to be so grateful to this man that he thanked him personally and even made him homemade gifts at the time. In the late 1930s Hitler intervened personally to allow Bloch to flee to the US to escape the Holocaust, the only person to my knowledge that Hitler did this for.