Marijuana Legalization: Life, Liberty and the pursuit of Happiness. Liberty: people deserve freedom to use marijuana. The first and most basic reason that marijuana should be legal is that there is no good reason for it not to be legal. Some people ask ‘why should marijuana be legalized?” but we should ask “Why should marijuana be illegal?” From a philosophical point of view, individuals deserve the right to make choices for themselves. The government only has a right to limit those choices …