This argument is both disingenuous and lacks reasoning. I should point out, I am not looking to attack you personally, just your argument.
With that being said, I can take the same approach with whataboutism and I can apply this to your champion causes. Climate change? I'd like to see climate change activists stop using cars, planes and any type of fossil fuels at the rate climate change activists demand we stop using them. You can't, because all your climate change leaders still use transportation that causes greater emissions than they say is appropriate. Furthermore, I'd like to see the left be as generous with their money at the same rate as how much they push for everyone to "pay their fair share." You can't do that either, because, statistically, conservatives drastically outpace in giving to philanthropic causes than their leftist counterparts in the majority of demographics (even in issues such as climate change that leftist claim to champion).
Now, I don't find this approach productive because it doesn't actually force us to examine the problem or consider any solutions, because it becomes a "who is a bigger hypocrite" game that doesn't actually move the progress line further.
So rather than the above argument, I would assert that there is a lack of responsibility and failure of ethics wrapped up in identity politics.
For starters, the argument of pro lifers adoption rates has no bearing on the ethics of ending a baby's life. Even if they didn't adopt a soul, this would not change that a baby was murdered at the behest of his mother. There are no objective ethics (both atheistic and religious) that supports killing a baby.
Second, this argument of pro-lifers not being willing to adopt is irrelevant, because they did not have a say in the matter and therefore have no responsibility in the matter. The pro-lifer did not force anyone to have sex, so why would we then expect them all to adopt these children? Rather we should have a healthy attitude about the situation, which is that when a pro-lifer adopts a child from an irresponsible person, we should celebrate them giving the child a better home.
With that being said, my wife and I have been on a waiting list for two years to get a child. Would happily stop a child's brain being vacuumed out and limbs chopped off and take them home instead, but, alas, we still waiting. Hell, I think a bipartisan solution would be to make adoptions have a more streamlined approach.