I don't know - fentanyl has done some serious damage to the population. I would probably disagree with what you are saying and how you are dismissive/minimizing its damage.
[1] https://www.nytimes.com/2022/07/13/magazine/police-fentanyl-...
That said there's been a lot of fentanyl deaths and it ain't making any communities better off having it. It's cheap, easy to get and the cartels can easily justify losing people to selling large batches.
Only way they can stop the cartels continue to get more of a foothold is by decreasing demand of the product. Not saying their approach is a good approach but I understand why they would try it.