I don't support your demand for asymmetric debate. If anything, unconventional positions require extra effort by the claimant not the respondent.
Parent didn't supply evidence and took a position that crimes that have existed for hundreds of years shouldn't be illegal.
I dont see why the onus is on the respondent to furnish overwhelming evidence to counter that.
I am fine stating that this position is out of touch with our democracy. Sorry that isn't sufficient for you.