Why would you want to influence the availability of an option just because you don't want to participate? If you don't want to get married don't. How does other people getting married affect you personally? Marriage is a social event, my guess is that it originated with the people within a clan wishing to make a public recognition of the desire to form a union which most likely would result in a family w/children being the outcome. The importance of witnesses was probably simply for documentation.
Eliminating a choice for another person is like making a choice for them, which is most definitely a form of control. So the real question is, "why do you feel the need to control other people?", the only person you should be concerned about controlling is the one immediately behind the tip of your nose.
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