Second order effects. If the past few decades have shown anything, its the second order effects that are much more important than any single effect.
What is the second order effect in this case? "Humans might be killed for organ harvesting. This leads to widespread uncertainty over who would be killed next. And uncertainty leads to other issues."
You can start working late in such cases. We have a lot of people who come to office at 1pm, and stay till 8pm.
If you are instead the kind of person who really works hard when "in the zone", you can try working 10-12 hours a day when you are motivated and then take a vacation/work 3 hours a day when you are out of your zone. That way you can charge up for your next "in zone" phase.
Kids get used to their parents being there all day during some days and not being there during others. As long as you can be there for them when there is something important for them, they and you would be fine.