Do you have a citation for that? I don't doubt it's possible but I've never heard it. As far as I know no major pain medications had tamper resistant seals at that point in history.
I've read a lot about this (being from Chicago myself) and do not believe you're representing it correctly. J&J took responsibility insomuch as they pioneered tamper resistant packaging, but they very clearly blamed a saboteur. The initial allegation was that Tylenol was unsafe. J&J successfully re-spun it, correctly, as an external terrorist poisoning their medication. And, to their credit, they did a great job making future Tylenol very safe.
But the bottom line is that these two incidents are very different. In J&J's case they were not at fault. In Boeing's case they were.
Info taken from https://www.ou.edu/deptcomm/dodjcc/groups/02C2/Johnson%20&%2...
If J&J had behaved like Boeing, they would have blamed the saboteur, blamed law enforcement, and blamed retailers while gradually and secretly fixing the packaging problem before regulators could force them to do it.
If Boeing had behaved like J&J, they would have taken immediate responsibility, voluntarily grounded the entire fleet even before all the causes were known, and put passenger safety first.