Firstly, political systems must also compete. Marxism competes with free-market democracies, and in order for that competition to occur, movement must be restrained. Failing political systems explode with refugees that bring unworkable mindsets with them.

Secondly, all people are equal before the law, which is an invention of the U.S. constitution. All people are certainly not equal. This is codified in religion in various forms ("As you did unto the least of these, you did unto me," karma/samsara, kafir, etc.). It is self-evident that equality is not reflected in wealth, social standing, influence, and power. It is also patently obvious that biology presents impediments to equality. You should not confuse a U.S. legal construct of equality with a generalization of equality.