@edgarblythe,
Your apparent position here bears a notable similarity to Grover Norquist's stance: That "bipartisanship is another name for date rape". Both of you are, I'd suggest, purists.
Of course there are many individuals who have long been associated with the GOP and it's key political notions/values who have now abandoned the party (for reasons all of us would deem reasonable and welcome). Many of them had been influential over decades in forwarding GOP interests in the past, people such as Michael Gerson, David Frum, Bill Kristol, Steve Schmidt, Max Boot, etc. Cheney is obviously one of this cadre of conservative thinkers who, as a matter of conscience, have stood up in resistance to the direction of the party they'd once supported and pretty much all of them have suffered consequences for doing so. Such behavior deserves to be lauded.