Why should the grassroots care about the future of the GOP?

The grassroots are in rebellion.  The rebellion has yielded a two man race for the nomination for the highest office in the land.  Of these two candidates, one seems to want to " unify" the party in order to save it.  The other is accused of wanting to destroy the character of GOP.  Thus, the contest now is said to be who can save the GOP?

But why accept this premise?  Isn't that how the left  likes to channel the discussion towards their policy goals?  In other words, it is a trick.

The trick is to get the stepchild of the GOP, the grassroots, to care about the future of the GOP.  But why should the grassroots care about this party?  Hasn't it continually abused the grassroots to the limits of endurance?  Why let them walk away with another victory?

If Trump ruins the GOP, maybe it needs to be "ruined".  For if it's fixed and healthy now, we certainly don't seem to be happy with it.  That was the reason for the rebellion in the first place.   The grassroots are getting outfoxed and robbed of a victory which should be theirs.  Cruz is betraying the grassroots by joining with the Establishment in an attempt to unify and save an "abusive parent" which doesn't deserve to be saved.

Cruz has gotten this far by rebelling against this Establishment.  Instead of trying to unite with them, he should be finishing them off!

Defeat the Establishment, and then let them find another home.  Welcome them back if they want to be more reasonable.   Until that time, they are still the enemy.

I don't believe Cruz.  I don't trust Cruz.  It doesn't appear that many do.  He alienates everyone, and then he tries to unite everybody?  How?   By changing the subject?