Giuliani apparently thinks that saying he hates abortion is enough. But pro-lifers will want to know why he hates abortion. Because it's taken the lives of 48 million unborn babies since Roe? Giuliani's "hate" line rings so false because temperamentally he is not one to hate something without outlawing or attempting to discourage it.
So far what Rudy has most effectively communicated is his distaste for people who actually hate abortion. He says pro-lifers want to throw women in jail, the canard that pro-choicers always throw at them, and he has implied that pro-lifers hurt the GOP.
Giuliani can upgrade his position by pronouncing Roe a constitutional monstrosity. Is opposing Roe and being pro-choice too confusing? Giuliani can give everyone a basic lesson in self-government -- you can hold a position without insisting that the Supreme Court mandate it. He should vow to veto any expanded funding of abortion. And in keeping with his (supposed) hatred of abortion, he should make it clear that he values the work of anti-abortion activists and understands why they would vote to prohibit abortion in a post-Roe world, even if he would vote the other way.
This would make Giuliani as acceptable as a pro-choicer is going to get to social conservatives. His position would still be a contrivance, but at least it would be a coherent and shrewd one. The alternative might be watching his campaign founder on an issue about which he cares very little.