And you're acting like a idiot playing along with a troll. At least you're not a troll, so I'll entertain you.
One, these people are psychopaths. As a medical school student in the U.S., I have in fact done some rudimentary research on this type of behavior. One of the key misconceptions by the general public and perpetuated by Hollywood movies is that a normal, healthy individual can just "lose it" and go on a rampage because of stress and whatnot. That is NOT true. People who commit such heinous crimes have SEVERE mental disorders which they are typically genetically predisposed to. Normal people simply don't go attack a bunch of random kids when they get pissed off. If there were such crimes against government officials, then there might be something to it, but murdering random children? No, that's simply the behavior of a psychopath.
In other words, there is NO socio-political-economic cause to it, other than the committing of similar crimes. One school carnage broadcast on TV might spur another one, which is what's happening here, and that is really the only cause. Sure, Wen promised to do something, the U.S. government has as well, but that's just politicians making empty promises in an attempt to soothe people's fears(I believe I mentioned that in a previous post). There is NOTHING they can practically do about it. Aggressive screening of mentally ill people can cause a LOT more problems than they solve, and guarding schools is simply impractical in the long run. Metal detectors are the only possible solution that may help, although people can get around that pretty easily.
What are the symptoms of that mental problem?
How can you read the symptoms?
How can you determine that this particular individual is having those symptoms?
Is this a hereditary disease?
How many such patients are now in China?
What age they represent in average?
What will be the treatment?
Will they be experimented in laboratories?
Is there any drug that can cure such disease?
Or will they be executed?
I know, you can't answer these questions.
What you are suggesting to do will be like
witch hunting that occurred in medieval Europe and continues to occur in Africa and even India. This will create further social problems. Suppose, a guy is having problem with another guy, the former will try to accuse the latter of being mentally unstable and if by chance locals get convinced, authorities will hunt down the innocent man and execute him. Thus, an innocent man will be victim of social paranoia.
Fear will prevail in the society and everyone will suspect his neighbors of having such mental disease. In the remote rural areas, people will take laws in their hands and will start killing people saying they were psychos.
If you study the recent cases, as far as media reports are concerned, you will find the criminals' excuses were not similar. The marital status of criminals for all cases are not similar. They don't belong to the same age. Though, I don't know about their records in family lives and their locality.