Drug cartels in the western hemisphere turn out to be pretty violent, to the point where you can think of them as terrorists -- bombings and other mass casualty events.
The other point you make is valid, though.
Sigma-Aldrich and Bayer don't seem like terrorist organizations to me. Or perhaps I missed the headline where Pfizer was caught beheading people?
Terrorist companies would be smarter than that. Sell and market a highly addictive, deadly drug, and profit from it making it look like it's all above board.
Then they blame the users for getting hooked on it on the first place after getting the doctors to prescribe it heavily using kickbacks. And thousands upon thousands of people die.
https://www.newyorker.com/news/news-desk/the-sackler-familys...
I'd give the US more points for enforcement (which you are correct is strongly pursued) if I thought the laws being enforced were less self serving in the first place...