On a micro level, I live in the US and I don't know anyone who takes fentanyl. "Every corner" is likely journalistic hyperbole.
Brown heroin doesn’t exist anymore. It’s all fent, they’re even cutting coke with fent which makes absolutely no sense to me. It started with oxys until the gov cracked down then everyone went to brown heroin until fent arrived. Report of Fentanyl in coke circa 2018. https://www.dea.gov/sites/default/files/2018-07/BUL-039-18.p... https://www.npr.org/2021/07/05/1013203805/party-drugs-are-be...
It makes a lot of sense if you assume they're trying to kill everyone