No, companies wouldn't behead people. That's silly. It's way too messy and doesn't scale.
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.
Sigma-Aldrich and Bayer don't seem like terrorist organizations to me. Or perhaps I missed the headline where Pfizer was caught beheading people?