It's not comparable, since the risk that some governments can assume may vary, but I believe that governments generally focus more on a global assessment, one that affects the country, and not on what affects specific individuals. More than anything, it's linked to economic and social situations rather than the risk itself of each thing. And regarding the political issue, imagine a country with a culture where drinking alcohol is customary at every celebration. This translates into more brands of alcohol, more jobs, and more money for the country. If the government were to take it away, it would translate into economic losses and social discontent, something that no politician wants to happen because it would be bad publicity, of course, unless it's a tyranny where those who make the rules don't care about the opinion of the people.