I think I get your point that the term “ideological purity” is a red flag for you. Is there a different one that you prefer?
Good lord, man. Were you not spending time here at FR during, and right after the 2012 election? If you were, then surely you're well familiar with the epithet, "purist", that has been thrown in the faces of honest conservatives by the Romney apologists.
The term has even leaked out into the blogosphere. I've seen articles posted here, where GOP-e strategists and assorted RINO pundits have used it in the same way as the Romney posse at FR.
For the apologists, we "purists" are responsible for staying home and handing the 2012 election to Obama, due to the fact that we couldn't bring ourselves to vote for Romney, who's violated nearly every one of our mutually held conservative principles.
These apologists have actually had the audacity to accuse us of living by our principles, and not succumbing to political pressure to elect a man who does not share them.
You're darn right, the term is a 'red flag' for me.