The ones you want to force to have children? Those the ones you talking about? You gave a good argument for abortion.
Currently, abortion is legal. That means if someone has a child, they did so by choice. If they are pregnant, unless it was rape, the action they took that produced the pregnancy was by choice. Why, when they don't like the results of that choice do they believe it's OK to kill what they produced? If you use that same logic, if someone is in a house they no longer like, it would be OK to burn it down.
If you claim that the choice of what a woman does with her body is hers alone and others should butt out, why is it when she chooses to have children she can't afford, those she told to butt out are the ones forced to support HER children?