Regulations and limits on gun ownership and commerce have been increased over the years, and these shootings still happend. The same thing with the countries that have banned guns. Here in Brazil it is virtually impossible to get a permit to carry a gun, but people die being shot by criminals with all types of "banned guns" every single day. Even democrats admit that no law or regulation would have prevented these shootings. And Europe have been dying like sheep in each of the attacks that they had, despite all their regulations.
So we're back to the same thing: banning guns don't work, because absolutely nothing, much less some law, stops maniacs from doing what maniacs do. Not only that, it makes it worse, because people who respect the law are defenseless and the maniacs know that and take advantadge of it.
Tampered proof bottles have no evidence of being effective. I'm not saying they aren't, but "some people killed" is not enough to pass regulations. If you provide me evidence that there was a significant number of people that died taking their medicine specifically because of tampering of bottles and then show me that after the regulation the numbers of deaths by this very cause has significantly reduced, then I'll believe you. But I doubt that you have that study, since most stupid regulations such as these just come out of nowhere imposing costs in business without actually having any benefit, simply as a result of some dumb sensationalist media crusade. Fro what I read, 7 people died. The fact is simply that the people who did this were arrested and that is why this stopped. In addition, an most important of all, Tylenol took a big hit because of this, so to save it's skin, it would have taken measures to garanty the safety to it's consumers in order to stop losing money, as it did. Otherwise it would go broke because other companies would do this and draw the costumers away from the original tylenol.
Finally I'm pretty sure the "tylenol deaths" weren't an epidemie too, but you still defend regulation over it. By the same token, why should drownings only be regulated if they are at epidemic levels? The mere fact that people die from it should be enough, as was the case with tylenol. You lack consistency in your arguments.