Reason #3 It's a good way to break social norms

Deep down inside of each individual I believe that there is a rebellious side. Granted, for most people it is squelched and hidden beneath the fabric of social expectations and the fear of reprisals. That might be assuming too much, and if you are adamant about the fact that you have no rebellious leanings whatsoever, then I acknowledge that this feeling may not apply to everyone. But, for everyone else who either openly or secretly agrees with me then I will offer my opinion on why mustaches can be a fun and harmless way to indulge this rebelliousness.
I feel like in recent history more and more people are embracing this rebellious side and taking radical steps to let everyone know how different they are. Elaborate tattoos, excessive piercings, and extreme clothing styles are examples of ways of showing this rebellion. The problem with some of them is that they are permanent, so once you've done it, there isn't any going back. While I don't have anything against people who choose to do those sort of things, I must admit that it isn't for me.
One of the reasons that I wanted to grow a mustache was to embrace this "rebellious side" of me, in a non-permanent, less drastic way. My mustache is a fun way of indulging the desire to be different. If you are someone who is sick of the social norms, and wants to do something a little out of the ordinary that isn't a permanent change, then a mustache might be the answer for you. A mustache doesn't mean that you have ditched your moral values or become irresponsible and reckless; many responsible adults have mustaches. I have enjoyed being a little different than everyone else because I have a mustache, though I recognize that not everyone wants to be different. If you are content with being another face in the crowd then that is your choice to make. But if there is a part of you that wants to "stick it to the man" in a small way, then the mustache brotherhood may be a good place for you.