It is the establishment that is helping Cruz, not the other way around. The establishment has already lost. They recognize it...but you don't.
What makes you think that an establishment candidate can succeed if they are opposed by both the Cruz and the Trump delegates?
do you not honestly see that you are voting for the establishment ?
they want a contested convention.
cruz wants a contested convention.
You vote for cruz then you vote for what the establishment wants.
So in fact you become an establishment took. a hack.