Utter nonsense! You are delusional.
In the United States, according to polls (Pew and Gallup), 91% of its citizens believe in contraception, and this despite the fact that an estimated 10 to 18 times as many unborn babies are murdered by contraception than surgical abortion.....
... Donald Trump is of course pro-contraception (pro-murder), pro surgical abortion in at least some cases, pro-divorce, supportive of ɧoɱosɛҳųαƖity and the legality of “gαy marriage”, etc. He has done some things to support the pro-life cause and the family, but there is nothing to indicate that he is anywhere near being integrally pro-life, pro-family, or pro-Catholic in his moral beliefs. There is of course, no way of determining how calculated or cynical in terms of political “opportunism” is his courting of the Catholic and evangelical vote on such issues. In either case, any notion that the current battle with the forces of antichrist can be engaged in effectively, and defeated, by such poisoned conservativism is pure fantasy.
http://rosarytotheinterior.com/archbishop-vigano-donald-trump-and-the-americanist-delusion-of-traditional-catholics/
Based on this, well laid out, I fail to see how a Catholic can vote for Trump. As you point out here, since Trump is pro-contraception and pro-surgical abortion, pro-ɧoɱosɛҳųαƖ, and pro-divorce, by voting for this man we would become formal accomplices in whatever evil he perpetrates along these lines, since our vote is putting him into power.
So, for instance, by having voted for Trump last time, knowing he was gαy-friendly, we have become formal accomplices in the latest pro-LBGT ruling lead by Trump-appointee Gorsuch.
As I reflect on this, I have come to the conclusion that it would be a grave sin for a Catholic to vote for Trump.
Double-effect stipulates that the action cannot be intrinsically sinful/evil. I find that it is intrinsically sinful/evil to vote for a candidate who stands for the things outlined above. Consequently, voting for Trump would be sinful.
As BTNYC illustrated so well, we need to avoid the temptation of being relativistic (another corollary to lesser evil thinking).
There was a TV show I watched years ago where a terrorist demanded that a government agent execute an innocent man (who may have posed a threat to their operation) or otherwise he was going to unleash a bioweapon that would kill hundreds of thousands. So the agent did it (with great anguish). But for a Catholic, the choice is simple. I cannot do this evil, even to prevent a much greater evil. We do not do the evil, and we leave it in God's Hands to deal with the outcomes. This is no different than saying that I'll vote for Trump because he'll appoint a Supreme Court Justice who will be less friendly to abortion.
Trump is a positively evil candidate and therefore we cannot vote for him in good conscience. Thanks for helping me make up my mind about voting. I had entertained the possibility of voting Trump on the basis of double effect, but I see clearly now that it does not apply here.
I will vote and will be writing in Patrick Buchanan for President.
I had had gone around promoting a candidate like Trump in the 1950s, you'd probably get excommunicated. But it's OK now since the other guy is worse?