It has been suggested in this forum that it is only a minority of people that take drinking to an excess. I suspect the same is also true of unfiltered internet usage.
The difference being, that a single person who falters online can negatively affect many people at once (the details have been spelled out at numerous asifos and dont require further details here). A person with a drinking problem, can negatively affect only those in proximity to him (although it can be quite a negative affect – especially if it causes injury or death).
It think if we spent more time teaching basic hashkafas hachaim and fostering greater yiras shamayim in yeshivos and bais yackovs we will be better equipped to deal with the challenges posed by the world wide web, drinking and anything else society throws our way. We dont. We are so busy saying that everything is bad, and then banning it, our kids dont know WHY these things are bad and when it isnt spelled out in black and white for them, they are at a loss how to proceed.
I watched a missionary “debate” several yeshiva bachurim on a Manhattan subway platform recently and they were simply at a loss about how to respond to his “questions”. (Its bad enough they werent even familiar with perek beis in tehillim) They really couldnt explain why yiddishkeit had an issue with people who claimed to be monotheistic but had a few different beliefs. They were unfamiliar with some of the basic Ani Maamins. If they cant deal with basic hashkafa questions, how can we expect them to deal with the challenges of the internet, peer pressure (drinking being an example – especially when it is clothed in “proofs” from poskim) and the myriad other activities that are the antithesis of what the torah wants from a yid. Stop banning and start teaching.