Forbidding unwanted children is not a realistic option based on current law, so discuss whether you prefer a greater burden of support for unwanted children to be on the state (i.e. your tax money goes to it) or on biological fathers. Obviously government resources are going to go to unwanted children either way, but if biological fathers have no support obligation, then even more government money (i.e more of your taxes) will have to go to supporting unwanted children. And with no support obligation men are likely less likely to behave in a way that will minimize pregnancy, possibly further burdening society with the cost of supporting more unwanted children.