This has nothing to do with rationalizing distant principles. Amnesty and chain migration will combine to bring us 60 million new Leftist voters. Getting a president in who on one hand seems conservative, but on the other hand gives away our future voter base will have much more of anything putatively conservative he effects many times over undone by the new voters he’s to blame for.
The idea that a year and a half before the general election bringing up the amnesty elephant in the voter’s booth is a vote for Hillary is offensively idiotic.
So is the concept that not voting against Obama (or Hillary) gives one bitching rights over those who actually vote for them. The reality of Obama having a second term and a Hillary even being considered is so more idiotic and offensive than the considering that it is all justified because the candidates aren't as hard-core "torch them all and save space by sending their ashes back over the border" as some folks seem to think it should be. To be able to discount the 1000 other ways we get damaged by allowing an Obama in makes this single-issue (and not fully accurate) becoming a "valid reason to teach us all another reason seem a bit insane. of course, it has been said that the truly insane don't realize they're insane so the arguments against them fall on deaf ears.