If the courts fail to uphold the constitution, how exactly are the people supposed to? By armed rebellion? By voting different people in office? I see a problem

If the courts fail to uphold the constitution, how exactly are the people supposed to? By armed rebellion? By voting different people in office? I see a problem with that line of reasoning, when candidates and parties cater to the needs of monied corporations rather than the demands of the people... Rather, the President, elected by the People, has a solemn duty to the Constitution, as evidenced by the oath of office they must take upon taking office: "I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States." (from wikipedia) Well, if a police officer in a small town violates the Constitutional right of a United States Citizen, does not the President of the Unites States have the right, even the obligation, to come to the aid of such citizen, and counter the actions of the police officer? Yikes, you guys read your history?