Because it's the logical conclusion of mainstream pro-life rhetoric.
By what standard? Nobody genuinely believes that the "logical conclusion" of the mainstream "don't murder homeless people" point of view must reasonably be a welfare state. Just because we don't kill people, doesn't mean they're entitled to welfare.
At the very least, the way many of the pro-life policies are implemented cause direct and sometimes deadly harm to women.
And what would you say is the over/under on the amount of women who die as a result? And what does that number look like as a ratio to the children killed by abortions? Because at least from the numbers I've seen, it seems like an entirely trivial ratio to be putting at the front of concern.
There are times when abortion is medically necessary to protect women's lives and we should allow them to make that choice for themselves
And you'll find overwhelming support for abortion in those cases. Just as I can't sucker punch some poor schmuck at the store and then just decide it was self defense because I wanted it to be, a medically necessary abortion actually has to be, well, medically necessary by some standards beyond "I want it to be".
Because to reiterate, there are vanishingly few people who oppose any and all abortions, including in medically necessary situations, especially once you exclude the pedants arguing that those situations aren't abortions by technicality, so therefore don't count when they say they oppose all abortions. This is also where those stupid "80% of people support abortion" propaganda pieces come from. Almost everyone supports some form of narrow allowance, at the minimum, for abortion.
Sure seems like a lazy way to dismiss the argument, just saying that he actually doesn't know what he wants.