Consistency in how the law is applied is important, but not that the composite of all laws be absolutely fair relative to each other. That is "foolish consistency" because it's impossible except by very closed-minded fundamentalism. The idea that you find the "worst" thing that is legal and then repeal all laws against things which are "better" is not a viable legislative strategy.
There is nothing foolish about treating things that are the same consistently. It would be foolish to grant animals citizenships to keep it consistent with humans, but just as e.g. human rights are applied consistently to people no matter where they come from or how they look like so should our policies to things be in general. Alcohol is a drug with a tremendous potential for harm, and if a society decides it wants to ban those, again there is nothing foolish in doing that consistently. But when looked at like that, it's clear there is not much rational in the way we regulate things. It's just a bunch of traditions and whims.
