I couldn't agree with you more, I just think there are ways in which a person like myself can accomplish just that without keeping my hair.
Because of my Sikh upbringing I have found myself leaning towards social justice issues. This has ultimately led to my seeking a law degree, which despite popular belief is a powerful tool to in creating widespread policy change. I am lucky to have found others in law school that are like minded and therefore we work together in trying to create change. It is when we sit together after a successful rally or protest that we talk about why we are doing what we do. It is only at this time do I declare that I am Sikh and it is my mission to serve humanity. The credibility gained by this approach has led to my colleagues asking more and more questions.
The dilemna I have is when trying to reconcile my ideals with the local congregation. How can I look my colleagues in the face and say now if you wished to learn more and become like us Sikhs all you have to do is, never cut your hair, wear a specific type of underwear, put on a steel bracelet, carry a comb ... oh and carry a dagger.
The two approaches just don't fit, so as you say neo-sikhs have destroyed the integrity of what Guru Nanak was trying to achieve.
Charn