A single law, not an entire government arm. Anyway we have plenty of people to watch over breeding habits (hence we get data like the one u just posted).
"local family planning bureau". A law which is enforced by said bureau.
"you're only speeding up a process that is already occurring" [China's falling fertility rates]. So I'm helping the over population problem now am I?
Not necessarily, there are other factors which can contribute to declining birth rates. For example, the one child policy, which was introduced in 1979, does not explain the drop in fertility rates from 6 to 3 (1965 to 1979). In actual fact, from 1980 to 2012, the fertility rate has only dropped by around 1 and it isn't even clear whether the policy caused it.
"Far more worthwhile than developing an entire government arm just to watch over people's breeding habits." So your agreeing with it.
Context, buddy. Why would I agree with your point?