Drug dealers deal drugs. This is axiomatically true.
If any of these chemical companies felt any sort of moral responsibility towards the safety of the users they would only be selling us compounds with well known safety profiles that have been approved by regulating agencies after going through proper clinical trials. But that isn't what a lot of people want, or even me - I wait for something to at least have some human studies or early stage trials before I'll inject it or swallow it, but people here go wild for SLU-PP-32, which we don't have a single published human study on.
And that's fine. I'm all for adults putting whatever they want in their body, even if they know it's potentially fatal, a la DNP. Which we have vendors that are more than happy to sell you, too.
But the same thing that makes these companies willing to sell us the things that the people on this forum demand of them is the same thing that makes them willing to sell opioids.