How many babies does it take to paint a wall? Depends on how hard you throw them.
What makes you tell a joke about killing babies?
I am always looking for a laugh.
Child abuse can be extremely damaging to children and affect their whole lives. Making light about it can be hurtful, just like you would be hurt if people made a joke about something that caused you pain.
I get it. The point is that this joke was in poor taste.
Correct. Making jokes about throwing babies against a wall marginalizes violence and it's victims like in this case where it is children. If you want to get a laugh, pick a topic that is lighter and won't cause alot of damage instead.