It was highly illegal. It was easy to get. The first dose was free and nobody needed a second one. It only took one time, one moment of temptation, to change you forever (nobody had tried to find an antidote and tangled ethics and poor economics made it unlikely anybody would outside the grim secret laboratories of carceral states, and what they found they wouldn't share).
Nobody had come forward to boast of having invented the pill or could find who was making it or why. And nobody who took it needed to be asked for an explanation. It was quietly decided more through silence than through debate to ignore those who did — to leave them to the strange envied state of no longer being able to feel despair — and hope that those who had children... What it was hoped the undespairing ones would do when making breakfast for their children, what they would give or not give kids too young for choice and too innocent for hopelessness, was also unexpressed and perhaps unknown.