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There is a difference here. When you order a drink you usually don't want roofies in it. Same with illegal drugs - when people buy them, they usually don't want to find deadly synthetic opioids in them - that's not what they are paying for. Synthetic opioids are purchased by cartels and retail drug dealers to cut into other drugs, so that they can cut them more, while users still feel something from a drug that has 1/20th of the amount of drug in it, with filler and synthetic opioid making up the rest. Often the dealers or cartels don't mix the powders too well or mess up the proportions and the buyers die.
There is a very clear difference between people buying research peptides or even AAS for their own bodies and drug dealers buying synthetic opioids which kill unsuspecting third parties.
After all it is the leading cause of death in the US under 45. Think about it. It kills more people than cancer, car accidents and suicides.