The people who make the laws that we choose to follow, or not, are just people. They are no different, or better, than you or me. If you look into the reasons that marijuana is illegal, it becomes obvious that the laws were not made with the best interests of the public in mind.
If you are the kind of person who needs others to tell you what you can and cannot do, that's fine..but you should really think before judging others who are fully capable of making their own decisions regarding right and wrong.
I think MOST people need rules to keep MOST people safe, because most people don't use common sense, many people don't know right from wrong (think of the vast number of people who drive drunk, or who leave their babies to cry alone at night), and I believe most laws ARE made with the public's interest in mind (who elses interest do you think rules are made for).
That being said, I think many rules designed to keep people from doing unsafe things aren't up to par, and there are many which are missing.
For example... I believe alcohol is far more deserving of being illegal than marijuana is.
In fact, I think alcohol SHOULD be illegal... precisely because, back to your original point, "but you should really think before judging others who are fully capable of making their own decisions regarding right and wrong", and thanks for making it, there are A LOT of people who drink, who ARE NOT fully capable of making their own decisions regarding right & wrong - and Michael Phelps is one of them - as he has driven drunk in the past (and as such, I don't think his decision making regarding mind/mood altering substances should be lauded).