Conscience forbids us to cross some lines.

Politics, of course, is about compromise. No candidate or lawmaker or president will ever agree with you on everything. Even if he did, real life — actual governing — would force the politician to compromise, to give up some good things for others.

Foreign policy, taxes, corporate welfare, immigration, entitlement reform, national security, civil liberties — all of these issues matter to conservative voters. Some matter more than others.

But the fundamental purpose of government is to protect the vulnerable from violence. There is nobody more vulnerable than a baby. Every year, with our government’s approval, the courts’ protection, and our own tax dollars, abortionists kill 1 million babies in this country. They kill tens of thousands of babies who have reached the age of viability.

Donald Trump finds that slaughter acceptable. That makes Donald Trump unacceptable.