I'm familiar with it. The "banality of evil" in that book isn't about regular people, it was about the leadership of the Nazi party willing to go along with the Holocaust for personal power, then trying to get out of responsibility for it by claiming they were "just following orders". Those aren't regular people, those are sociopaths.

Regular people don't all independently decide to "do evil". There is banality in the ones that agree to go along with it, to save themselves from being ostracized or mildly inconvenienced. Do they perpetuate evil? For sure. But are they the villains responsible for it?

The "evildoers" are the tiny minority of sociopaths doing the convincing, because it nets them more personal power, and they don't care who they hurt along the way.

There is a huge amount of injustice in the world, morally speaking I should be out there fighting against it with everything I have. But I'm also the sole breadwinner for my family and I have a mortgage, so I mostly keep my head down and try to survive. Does that make me an evildoer? I sure hope not.