Your second paragraph gives a single example which is apparently supposed to support that conclusion. That's a definitional example of cherry-picking and hasty generalization.
The projection comes in because it's difficult to see how you would reach those conclusions from the available evidence, unless you're projecting.
And if you want more evidence than that, then I suggest reading about Stanley Milgram’s famous experiments. A little quote:
Moreover, even when the destructive effects of their work become
patently clear, and they are asked to carry out actions
incompatible with fundamental standards of morality, relatively
few people have the resources needed to resist authority.
If you're unaware of all the criticism of Milgram's experiments, then you have some studying to do before we can have a meaningful discussion about this.
While you're catching up on the history of social psychology since 1961, you might want to ask yourself why it is that you're so eager to believe that "ordinary people are mostly evil". Do you have a religious background, perhaps? "Original sin" and all that?