It's not. It's the well thought out process based up many possibilities.
The best possibility is that the best candidate wins by getting the required minimum number of delegates according to the processes designed by the States.
It is also a possibility that the WORST candidate wins the required minimum number (Think Hillary and a Federal Indictment). And what if the Candidate commits Treason or Murder just after getting the minimum requirement?
Didn't think of that did you?
It is also possible that the Candidate dies after getting the minimum votes, what do you do then?
Didn't think of that either did you?
The system works as designed for our Republic.
In the case of Colorado, the rules for caucuses have not changed since 1912 and are on the Colorado website. And to change the rules while in the caucus process is not fair.
What happened here is a failure in the ground game of Donald Trump and his followers are bitter over it.
They change the rules all the time. They changed them to keep Ron Paul out.