I think it is a stretch to say that Prohibition almost destroyed the country, just as it is a stretch to say that Bill Clinton almost destroyed American. America is a pretty resilient country.
Prohibition had more people using alcohol than ever before, and made billionaires of bootleggers to the extent that their family dynasties are still screwing up the country to this very day.
You can find people who claim it did or didn't increase alcohol use. From the web searches I've done, it seems that people can find facts to support either conclusion. But more importantly, alcohol is not crack or heroin. As I've said in the past, I think people can draw legitimate parallels between Prohibition and anti-marijuana laws but you should note that bans on opiates and many other drugs pre-date Prohibition and have survived its repeal.
Had there been no prohibition, Teddy you know who, would be just one more drunken slob, wallowing around in his own puke,pee and feces in some nameless gutter, instead of being in a position to block every rational bill that his bleary blood shot eyes behold.
If it weren't Teddy, it would be someone else. The country has no shortage of rich leftists.