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.
I think that if you want yet more evidence then you can probably acquire it yourself. Personally I must sleep.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?
Some of the criticisms are valid, and the results to not reflect well on us as people. The 33% of people who can keep to their stated ethics in the face of authority probably have a really hard time believing that 66% of people cannot. To them it seems easy and obvious that you just don’t violate your ethics. But imagine it this way: for hundreds of thousands of years humans lived in tiny tribes wandering in the wilderness. Failure to heed the orders of the tribe’s leaders would have been a virtual death sentence for most of that time. That environment literally breeds for people who obey even when they think it’s a bad idea. That’s apparently not long enough for the trait to have become universal, thankfully.
I don’t know about the TPSE though. I didn’t cite it either.