So let me ask you this question.
Would you buy a product made by a slave?
Red herring question.
Here’s the problem with your hole position. Basically you’re saying that a guy that smokes pot is bad because a fellow “employee” of the guy that sold the pot to a guy who sold the pot to a guy who sold the pot to a guy who sold the pot to the guy smoking the pot killed an innocent bystander. If you’re going to play six degrees of seperation on guilt like that we’re all going to hell.