This is ends justify the means thinking though. Sure God could have turned the very place where Sodom and Gomorrah would be built into a lake as soon as it was built, thus saving the fate of many people who would end up being born in Sodom and Gomorrah.

If God did this for every scenario, there would be nothing that happened ever.

And because God is infinite, God could have it where a baby who is aborted is put into a simulated reality where they were not aborted and it plays out based on whether they accept Christ, as just a possibility. The fate of babies who die is mysterious, but if God says don't do something, don't do it and trust He has the answer.

The same is true of children who were sacrificed to moloch. It's highly likely the children, had they not been sacrificed would have grown up in that culture into pagans who ultimately end up in hell. How does the Bible treat the Moloch sacrifices? Horrible, because ends don't justify means and we're playing God by aborting based on what we assume happens to babies.

Could it be that just as there are levels to closeness to God with angels, with some being the ones that fly around with their eyes covered, flying around God, that in heaven there is far more glory in being in heaven having accepted Jesus than having been aborted. Not that anyone would be sad in heaven, but in heaven some have more than others (wood, hay stubble vs jewels). It may be that the glory of being in heaven because of accepting Jesus is so incredible that it is worth the incredible risk of facing an eternity of hell.

To put it in another way, think of a person who's protected from all things. They live in a safe padded cell. Their risk from murder, and disease and everything is effectively zero. Then you have another person, living out a life, but they risk murder, accidents, dismemberment, etc. Who do we say had a richer life? Not the safe person, but the person who had risk in their life.

If that's true here, it might be true in heaven. It might be that babies in heaven are made ignorant of how much better it would be to be in heaven with that risk afforded to them, and while it's better to be in heaven than in hell, it is better to be in heaven with the risk of hell than in heaven without the risk of hell. This is just a possibility. Things of this nature we just go with trusting Him like when God questioned Job and revealed to Job through the questions how little we can grasp of reality, particularly the supernatural reality.