Laws against consensual "crimes" work drastically less well than laws against real crimes that violate actual rights; the FBI reports that two-thirds of murders get solved, whereas the proportion of drug "crimes" that are even made known to law enforcement is assuredly several orders of magnitude lower/
Consensual crimes are rarely harmless. They hurt law-abiding neighbors who live next to whorehouses and crack dens. It’s called the broken-windows effect. Little things like broken windows create a sense of lawlessness and hopelessness.
Lots of people are harmed when libertarians start breaking windows, doing drugs and fornicating. Our increasingly childless, selfish slacker aborting society is going down in flames because of godless libertarians.