Did you read the National Review reasoning for their endorsement of Romney?
The operant term is "viable".
That's where I "get it".
I have no problem with your supporting Romney, other than your reason that he is the only "viable" candidate.
I have no axe to grind here with you. I am not a big "R" Republican. Was, and an active one in time and money for 30 years. The last ten years I have been performing my civic responsibility as a nonaligned little "r" republican.
And I believe I have moved even one notch further from the Grand Old Party. I will no longer vote for their "viable" candidate. I will vote for my candidate, even if I have to write his name in. Which, whether you like it or agree with it or not, is my prerogative.
Diminishing those with whom you disagree serves more to diminish you and more so your choice of candidate.