If the government has this right, what else would this lead for them to enforce? preserving food consumption by governing how much food one family can buy? Governing the economy by setting restrictions on how much money a certatin family can make? To better then environemnt by governing and setting restrictions on the amount of miles you can drive your car a day?

Those examples may seem absurd now, but if you grant the government the right to control persoal freedoms like how many kids you can have, think about what else the governement might see fit to govern. It's giving the government too much power. I don't know about you, but thinking of the possibilty of having a government like that is a bit frightening.