The reasons why people wanted a prohibition on alcohol because of the apparent effects it had on people - and you still see them today (but probably not as common as back then or as hyped in mass media).
As it became increasingly clear that National Prohibition was failing to prevent the consumption of alcohol and also that Prohibition itself was creating more and more serious problems, people came to believe that Prohibition was a bigger problem that the consumption of alcohol.
No, it was an excuse used by temperance activists.
National Prohibition in the US was repealed because 74% of the voters had come to believe that it failed in its purpose but also created enormous and serious problems.
By increasing crime, Prohibition led to violence.
He made them do what he said!
It was thought that alcohol was destroying families and the fabric of American society. It was thought that denying people alcohol would stop them from craving it and lessen crime. Funny how that turned out.
Prohibition was repealed because about 75% of U.S. voters came to believe that it caused much more harm than any good.
There were millions of people alive during the prohibition period. Some still are
Many people opposed the repeal of National Prohibition and hoped that WW II would lead to Prohibition, just as WW I had earlier done.
It was thought that alcohol was destroying families and the fabric of American society. It was thought that denying people alcohol would stop them from craving it and lessen crime. Funny how that turned out.
People found out that prohibition not only does not work but that it is counter-productive, causing very serious problems itself.
State-wide alcohol prohibition was finally repealed in Mississippi in the 1960s (about a third of a century after the repeal of National Prohibition) because many residents came to believe that prohibition was a failure and caused serious problems. However, local option continues to exist in the state.