They also know that there are people who break the law and they'll still buy the products. Sort of like it's illegal to smoke certain substances, but you can still buy decorative vases which facilitate their use.
We are as gods to the beasts of the fields. We order the time o' their birth and the time o' their death. Between times, we ha' a duty. - Terry Pratchett.
"Men have forgotten this truth", said the fox, "But you must not forget it. You become responsible, forever, for what you have tamed. - Antoine de Saint-Exupéry