As other commenter said - they are consistent. If abortion is murder, that’s any abortion. If it’s not, then no abortion is a crime.

The only case where you want to forbid abortions generally, but allow them for rape and incest cases, is if you are a fascist who wants to force women to give birth except for most outrageous cases (also with rape the child is more likely to be, eh, not loved by the mother, while with incest more likely to have pathologies), those likely to be less useful for their demography fetish.

So in this case Trump is worse than his supporters if we try to deduce logic from the position taken, while his supporters are worse in practice.