My Support for it is because we are a Union of States, i.e the United States. Our founders rightly believed government is most responsive at the local level, as such they only engineer one 1/2 of 1 branch of the federal government to be popularly elected. I believe this is the correct measure.
Direct Democracy tends to devolve into dictatorship, and we have seen this in American History as we become more and more "democratic" in our processes, more and power power has shifted to the federal government, and as more and more power has shifted to the federal government that power is further concentrated not in congress but in the Executive Branch, and the Administrative State.
So much so today that agencies of the federal government on a whim or executive order can simply establish new regulations that make millions of people criminals, or completely change entire economic markets with no input from Congress or the people, and in fact it takes an act of congress (or worse the Supreme Court) to stop them.
This is a complete and utter bastardization of a republican form of governance.
Eliminating the electoral college further drives us towards a more direct democracy, something I oppose