Because there are some technical solutions to some societal problems. Are there technical solutions to the ones we are discussing? Possibly, possibly not, you don't know until you look.
the societal problems are solvable only through technology. At least that is the main premise of Das Kapital - the progress in the tools and means of production is what drives societal progress.
I dare you to name a societal problem which was solved independently of the technological advancement state of the time, i.e. a problem that could have been solved the same way with a significantly regressed state of technology when at the time of its actual solution.
i don't understand what societal problem you do you mean here - the prohibition or the alcohol. If you mean that the societal problem was the prohibition then we do know that it was solved by the bootlegging at a massive scale which relied on using cars and machine guns with modern communication of the time - telephone - playing a significant role too. If you mean that the problem was alcohol - i don't see where and when it was solved at all.
Bad laws become "bad" and get repealed when they become untenable to maintain. Cars, boats, planes, guns, drones, global financial system, crypto, social media, scientific development of our understanding of addiction - it all leads to the untenability of the current drug regime and the resulting progressive decriminalization we see.
Clearly that's incorrect though. We're only seeing legalization of socially acceptable drugs. Tech has nothing to do with it.
Nobody is fighting for meth, cocaine and heroine to become legal in the US. We also have plenty of prostitution going on thanks to technology but that won't be legal anytime soon either. It will happen when people decide they're OK with it, not because technology makes it easy.
