When is it necessary to conform?

From the lighter side: "Only when someone is watching..."

But seriously: Websites (such as WikiAnswers) require participants to conform to certain guidelines. Schools, social groups, and sports clubs require conformity in various ways. Society at large requires some conformity (even here in California!). If you want to obtain a license to operate a vehicle on the public roadways, you will have to conform to certain rules, most of which are based on common sense and safety. Prospective employers will want you to conform to certain guidelines as well.