You misunderstand the hypothetical. All, or nearly all, people are capable but only a few would. My point is that evil exists and to ignore it is a problem. Several people in this discussion have attempted to say that capitalism is the cause of evil. This is obviously untrue. Capitalism can enable evil, but to claim that a different economic system would eliminate evil is ridiculous.
Capitalism exacerbates many things, including crime, violence, and instability. From a leftist perspective, private property is given rights, which artificially increases the amount of crime statistics. If private property were abolished, the only crimes that would occur are between people. It will still happen. But most crime is committed out of desperation to meet their needs.
I understand what you're saying, and disagree. I didn't say that a neighbor can't do antisocial behavior. I'm saying that you should trust your neighbors until they give you a reason not to, because your neighbors are not your enemy.
I never misunderstood my position. I don't know how else to convey the idea that some neighbors might be enemies.... yes obviously most are fine. We should give everyone the benefit of the doubt... but the economic system doesn't fix the truly demented.