The Five K's, along with the turban, constitute the Khalsa uniform, which distinguishes a Sikh from any other person in the world, and is essential for preserving the life of the community and fostering the Khalsa brotherhood.
The Five K's are not supposed to foster exclusiveness or superiority. They are meant to keep the Sikhs united in the pursuit of the aims and ideals of the Gurus. They enable them to keep their vows made at the time of baptism. The Sikhs have been known to face torture and death rather than cut their hair or remove any of the sacred symbols.
The Khalsa cannot be anonymous. His religion is known to all. He stands out among people, and any unseemly behaviour or action on his part would be noted as unbecoming of a follower of the Gurus. People would easily blame him if he deviated from the disciplinary code of Guru Gobind Singh.