I don’t believe anyone is arguing that people should not be tried and convicted of CP crimes. I think that Grisham’s point was (and still is) that there is a disproportionate punishment of the offense. And proportionality in punishment, no matter the crime, is a fundamental principle of Western law.
RSOL does not “coddle” criminal activity. Instead, RSOL advocates for just and equitable punishment, and is entirely opposed to punishment that extends well beyond a sentencing order (which is, in effect, what registration does).