haha yes well I thought you might have spent too long in a self induced stupor red eye ;-)
The point I make is that merely because other potentially harmful substances are freely available it does not mean they are all equivalent, nor does it mean that we can add to the list any potentially harmful substance on this basis.
This brings me to my second point - while you are correct in that a comparison contextualises the various substances, it does not alter the base effect of them. Cannabis may be less 'dangerous' than alcohol, it may be more, it is still dangerous and should not be freely available. I believe this position is logically defensible at our present moment in time as there is ever mounting (admittedly anecdotal as far as I'm aware) evidence that cannabis is very harmful to the mental state of those who use it. The predictable come back that most use it without consequence does not hold water either as many class A drug users also suffer no effects (MDMA, cocaine) - would you support their declassification based upon this logic?
The article (cba to read it I will trust you have summarised it correctly) raises an interesting point in whether social and legal issues are a factor in the undisputed gateway effect of cannabis. Personally, I believe they may very well be, and yes the Netherlands has apparently decreased the gateway effect of cannabis through its control.