The nation is not one person. What benefits one may hurt another. What is ideal to a Republican is not ideal to a Democrat. Otherwise, what part of a chain of command is not working? Yes, politicians serve the people. They also serve the party. The party serves the people? Which people?
What part of what Trump has done is not in line with "the people" that elected him? "The people" elected Trump, and Republicans to the House and Senate. Yes, Democrats complain about Republicans, Republicans complain about Democrats. All in all this is a dysfunctional system.