Why should the governments be allowed to govern ones body, sugar is a bad drug so maybe they will ban that one day too and when that happens would you be happy to not have any sugar in your morning coffee?
There are certain drugs that should never be given out freely like meth and crack because users very often can become violent after use but other drugs like heroin, marijuana, maybe even cocaine should be freely available from chemist shops like they once were. The people are getting high anyway so why not let the governments earn a little tax from them, although with the taxes governments have been know to charge it would probably still be cheaper buying your weed off the street.
Sugar is different from the drugs which you are mention, consuming sugar wont make you addict but consuming heroin, marijuana and even cocaine will make you addict and after some time you cannot live without this drugs and you are telling it is not wrong. Their are some rules which all human beings should follow to live a decent life if not their wont be different between human and animals
Thia link should say how bad sugar is: https://www.atkins.com/how-it-works/library/articles/10-ways-sugar-harms-your-health