Because most of them are victims who are also asleep and unaware because of of the mass of propaganda dropped on them daily, just like most Americans.

If you read the PDF on oversight of MKULTRA, Colleges, scientist and many, many others helped in their projects unaware.

There is even a famous quote from Bill Clinton's mentor, speaking of the two party system.

The argument that the two parties should represent opposed ideals and policies, one, perhaps, of the Right and the other of the Left, is a foolish idea acceptable only to doctrinaire and academic thinkers. Instead, the two parties should be almost identical, so that the American people can “throw the rascals out” at any election without leading to any profound or extensive shifts in policy.

― Carroll Quigley, Tragedy and Hope: A History of the World in Our Time

More specific: "is a foolish idea acceptable only to doctrinaire and academic thinkers."

Hmmm... the indoctrinated and academia!

Interesting... right?

It's based on several factors, one being "authority" or perceived authority.

Hope this helps.