why is legislation and the need to comply with the law so essential when offering services?

Answer 1

Because America is the land of the opportunists. If Legislation is not well crafted there will always be someone looking to sue for discrimination or other problems.

Even in the case of Legislation that doesn't provide a service its important. Passing an important law helps no one of its tied up in legal challenges for years. Its better to be right the first time than fast.