It so easily could be changed, but we are collectively trapped by the delusion that the only route to safety is to make drugs illegal. You'll see it here on HN, in this thread, about how the "dangerous" drugs should not be readily available because people will get hurt if society lets them have legal access.
It's such an easily solvable problem and we collectively support the worst possible way to deal with it -- it's crazy making.
Overdoses on opiates happen even with legal opiates [1] and it's related to tolerance mechanisms. You become tolerant to euphoric effects much faster than you become tolerant to respiratory depression and nausea.
This basically makes opiates much more dangerous than any other drug class.
[1] https://www.cdc.gov/drugoverdose/featured-topics/overdose-de... - prescription opioids alone contribute to 9.2% of overdose deaths excluding alcohol.
My brother died of a heroin overdose many years ago. If it had been legal, pure, and known quality that likely wouldn't have happened (he could still have been affected by addiction like our mother with alcohol, but he wouldn't be dead).