I was once chosen to be in the crime survey you are talking about. The survey taker was relentless in calling me to set up the interviews. I had no reason not to tell the truth, and I believed the assurances I was given concerning anonymity and the like. It was all pretty routine. No undercount came from my answers. Or overcount.
I think that abolish the criminal justice system is a good slogan. As Michael Tigar pointed out in a Monthly Review essay that was, I think, part of a special issue on prisons and the CJ system in the United States, every aspect of this system discriminates against those without money. It is corrupt from top to bottom. There are plenty of dangerous people out there, but if Finland can say that a triple murderer shouldn't obviously be locked up forever and believes that such a person is not irredeemable, then why can't we do the same?