40~50 is another problem that oversea people could not see it. All killer's age around 40 to 50. There is very fast pace in China and usually over 35 years old they hard to find a good job there. That is a kind of reason we immgrated to Canada. There is a posibility to get high level position in China if you have good education background and special network. But most people only get lower level job. And each year there are lots of new students looking for a job. That's a kind of high pressure in job market. And none educated over 40 single male will be big problem in current situation.
It's a mental illness with those killers. Because those people are lost their future. They were killing baby to kill others future. Government should give them a hope instead of send more guards.