Selling drugs vs. selling alcohol, this is beyond morality matter but a matter regulated by law, sorry.

There was no equation there actually. Let me unwrap it for you, probably this way it will be clear: first line was a satire of the parent comment along the line of depicting deadly but permitted matters; second line was the unpacking the satire higlighting that the fella hopelessly confused (now, this was more like the equation you sought) a socially permitted activity with an illegal one.

Law is based on a common consensus of morality (at least in theory) so they are, in fact deeply intertwined.