^Yes, especially when coupled with the fact that they kidnapped his wife, extorted the family for money and inform them of what they would do (threaten them essentially)
Kidnapping is far from it. Forced it may be, it was still legal, only up to the abortion stage itself then matters went black. If they were taken to jail for failure to pay the fine then matters would have been different, no doubt they probably would have had to 'kidnap' her to place her in jail.
Anyway the money was owed, it wasn't like they were stealing cash from her, the law is there. If you break the law here in Australia and fail to pay the fine anyone would expect to be repeatedly pestered by the government about the payment. They were no threats, although they work for the government, they are citizens like the couple as well, they have a job to do and there is no clear benefits from threatening anyone (and as previously mention it wasn't even threatening). The money goes to the government, not them.
Parents choose to have smaller families when health conditions improve so that they no longer have to fear that many of their babies might die, and when they do not have to rely on their children to work on the family farm or business or to take care of them in their old age. In addition, more parents are sending their daughters to school, which is important also because women with basic education tend to produce healthier children and smaller families. More women now have opportunities to work outside the home, so they are
starting their families later and having fewer children. On top of all that, access to family planning is improving, so parents can control the number and spacing of their children.
http://www.worldbank.org/depweb/beyond/beyondco/beg_03.pdf
This is not a solution. This is a reason as to why parents choose smaller families, not how to solve China's overpopulation. It even states so in the first sentence.
Also, I challenge anyone to find a better method of dealing with overpopulation in China which does not involve forced abortions to those unwilling to comply.
Polygamy could possibly solve the answer. As Paul mentioned, there are more men than women, polygamy would satisfy a large proportion of women, and having a relatively small number of babies to parents could easily solve the overpopulation issue. There would be much more space as there are more than a couple living in a single home.
The only problem is getting them to accept it =/.