A people so full of culture and values. How did they create a Holocaust?

I have a question that is bothering me.
How did a people full of culture and values ​​reach this low point?
Isn't it discouraging to even invest in being good and valuable?
Maybe I'll invest and in a generation or two my heirs will be predators?
This may be a strange question, but it has been bothering me for years…