The Catholic theologians don't agree with you. Sorry. You're free to abstain though, if your conscience so dictates.
Yeah, the same theologians who led us directly into Vatican II.
Most of the theologians cited healthily preceded Vatican II. Lehmkuhl, Prummer, and Tanqueray passed most of their lives in the 19th Century.
You're committing a fallacy called 'poisoning the well.' Are all theologians prior to VII positively suspect? Going back in time, at what point do they cease to be suspect? Really, to make any sense here you need to show that there's some positive reason to suspect the orthodoxy of these particular men.
When you vote for the "lesser evil" candidate you have on YOUR hands anything wicked the person does in office. If you vote for a "Pro Life" candidate who then goes on to bomb innocent people in the Middle East or who aids/abets the slaughter of Palestinians by Israel, then those Palestinians' blood is decidedly on your hands.
Double effect, Lad. It is licit to vote for a bad candidate to prevent a worse candidate.