The Constitution of the United States balances the power between the individual people, the State governments, and the Federal Government.
The idea comes from historical evidence when you have divisions of power between 3 groups, you have:
1) Stability
2) Peace
3) Liberty
When you weaken the power of one and create only two parties of power, you then have a power struggle between the two remaining parties where one dominates the other. This creates, tension, conflict, and an eventual loss of liberty.
The reason why we have so much tension between the Federal Government and individuals is because we've eliminate State power in the Federal government which previously provided additional checks on Federal Government. Thus in a struggle for power between the individual and the Federal Government, the Federal government will triump over time, as we are seeing now.
If we want to strengthen the individuals, we, counterintuitively, need to restore power to the states. Not take more power away from the States. The best way to do this would be to repeal the 17th amendment and Restore the Senate to the States as the Constitution originally designed.
Not only would that provide another check on the Federal government, but it would severely weaken the power of special interest groups because they would no longer be able to finance the direct election of Senators.