I understand what you are saying.
With only a few exceptions, my entire voting experience has been to have a choice between a candidate I don't particularly care for and one much worse.
That is the beauty of the two party system (at least for the two party in-crowd).
They give people the illusion of having a choice while being assured the ultimate winner will be someone they find satisfactory.
But the 1992 campaign of Ross Perot showed that the two parties have a lock on the process and abhor outsiders or insiders who won't play by their rules.
That is what has the GOP in such a fit about Trump and Cruz.
Except that I believe that Trump will screw conservatives and this country MAJORLY. So, if Trump wins the nomination, I see two choices:
1. Vote Trump.
A. Hillary wins. Same outcome as Romney and McCain. I was forced to hold my nose and the other team won anyway. Not only did the candidate I voted for lose, but I feel dirty about my vote.
B. Trump wins. Trump screws conservatives and the country. Republicans take the blame, thereby screwing the conservative movement for decades. I carry the guilt of having participated in that fiasco.
2. Write in someone else
A. Hillary wins. I voted my conscience. Hillary screws the country. Democrats take the blame, thereby screwing the liberal movement for decades. I personally know that if Trump won it would have been the other way around, so I can still feel good about my vote.
B. Trump wins. I voted my conscience. Trump screws the country. I and many others like me can claim we didn’t take part in the debacle. True conservatives coalesce into a third party that rise from the ashes of the mess Trump created. The GOP, and it’s pathetic primary system, die off.
That’s the way I see it because it starts with my firm assumption that Trump we’ll screw us. Since I have plenty of evidence to back that up based on his past, I can’t be convinced otherwise. So, I clearly have one option: vote my conscience.