I will vote for McClintock (provided he doesn't withdraw at the 11th hour) even if it means a Bustamonte victory. It's not so much about installing "our candidate" as it is holding Davis (and other politicos accountable) for their actions.
I will not sell out my vote for the sake of GOP political expendiency to someone who's positions are indistinguishable from the Dems. A wasted vote IMO is one where a voter really wants to vote for Republican candidate A but holds his nose and votes for Republican candidate B for the sake of a Republican win.
Then you yourself are a Republican-In-Name-Only. True Republicans want their party to win elections.