The idea that the government poisoned bootleg whiskey and that the government did so to kill people who drank illegally is misleading and inflammatory, but I do admit that what the government actually did was dangerous, deadly and wrong and definitely not the best solution (no pun intended) for enforcing Prohibition. Let's not, for example, make it sound like the government skulked around secretly poisoning moonshiners' stills (or legitimate alcohol-producers, or leftover bottles in people's liquor cabinets), and then running back to their offices and slavering over reports of drinkers dropping dead or going blind or crazy.
In actuality, the government required the manufacturers of industrial alcohol (which was already unfit for human consumption) to "denature" it — that is, make it poisonous, and thus, wholly unfit for human consumption. Criminal masterminds then stole the alcohol, hired chemists to try to "renature", sold it to purchasers (eg, owners of speakeasys), who sold it to customers, who then drank it.
In addition to stating that #1) what the government did was dangerous, deadly and wrong, let's also admit that this is also true for #2) the makers of the denatured industrial alcohol, #3) the mastermind criminals, #4) the "renaturing" chemists, #5) the purchasers, and #6) the drinkers.
Otherwise, we might as well say that, today, in this day and age, Sterno and other makers of chafing dish fuels "denature" their product to purposely murder/blind/dement sterno drinkers. Or that pharmaceutical giant Schering-Plough makes Coricidin with dextromethorphan *and* chlorpheniramine maleate, to purposely make it the preferred DXM product for some young people because the CPM interferes with the metabolism of the DXM, which might give them a higher high but can also cause serious bodily damage and death.