Forgive me for what may seem like a stupid question. And in asking this I want to make absolutely clear that I believe abortion is pure wickedness.
First a passage:
I wrote to you in my letter not to associate with sexually immoral people—not at all meaning the sexually immoral of this world, or the greedy and swindlers, or idolaters, since then you would need to go out of the world. But now I am writing to you not to associate with anyone who bears the name of brother if he is guilty of sexual immorality or greed, or is an idolater, reviler, drunkard, or swindler—not even to eat with such a one. For what have I to do with judging outsiders? Is it not those inside the church whom you are to judge? God judges those outside. “Purge the evil person from among you.” (1 Corinthians 5:9–13, ESV)
Does this passage not imply that in such a case where men and women admittedly reject the Lordship of Jesus (e.g. our wicked rulers), it’s not our place to expect them to walk in/promote righteousness (e.g. pass laws that protect the unborn) and condemn them when they don’t?
Unless the entire point of such a letter would be to call out the sins of these magistrates (and the people who love to have it so) in order to call them to repent of their rebellion against God and to turn to Jesus Christ in faith. Then good and well.
But, with all due respect to Tim Keller, I wouldn’t hold my breath to wait for him (or any popular evangelical leader for that matter) to do anything of the sort. At best, perhaps we might see a letter making a humble appeal to reconsider this new law (in distinction to a call to repent) because in the author’s humble opinion such a law is detrimental to human flourishing. But I’m guessing that’s not what you’re looking for here. Or is it?