Part of the reason people do that is to push them.

It is actually easier (when using negative reinforcement methods of social engineering) to manipulate someone into doing something by putting them on the defensive for something they didn't do. You can also cause people to over compensate to defend themselves if they did do it.

I don't think they're all pedophiles, rapists or murderers...but by applying that stigma to all of them, we are slowly building to a point where they have no choice but to defend themselves or lose everything anyway.

I also don't feel bad for the threatened and blackmailed; as a citizen, it is not my job to fix that. My only concern is the right thing being done. Is that cold? Sure. I agree. But it's also a cold, hard fact.