The Bill of Rights has been a source of contention since the beginning. As you suggest, it is used to define the rights we have allowing the government to infringe in areas that should be of no concern. The Bill of Rights serves no purpose whatsoever since what it proportedly protects was already protected by the limitations enshrined in the original document. The Bill of Rights is superfluous and adds nothing.
Further, some do not even understand that it is only a prohibition on the Federal government. The words "Congress shall make no law" are so plain and obvious that a fifth grader could explain its meaning. Yet, some think its scope is expanded because they don't like the idea of united sovereign states, as the Founders intended. And even that misguided idea continues despite the opinions of the highest Court in the land. Barron, Slaughterhouse, Cruikshank, Adamson and common sense correctly describes what a grade school student would recognize: the Bill of Rights applies only to the Federal government.