That's all entirely fair to point out - clearly serious breaches happen, even in heavily regulated environments! I don't think failings in those arenas undermine the notion that legal risk and quality/authenticity risk of illegal drugs is very often intertwined.
I think even folks over at Erowid advise caution in dealing with these things. In that regard, conflating legal risk & qualitative risk isn't really a non sequitur. That's really all I was trying to say.
I understand your point, but - as you identify - LSD users are more aware of the risks and have a higher perception of risk.
Although I don't have evidence either way, my suspicion is that this results in a comparatively low risk in truth. It's not immediate that the legal status impacts on the risk at all.
I think even folks over at Erowid advise caution in dealing with these things. In that regard, conflating legal risk & qualitative risk isn't really a non sequitur. That's really all I was trying to say.