All nice measures, but I have to think it would more effective to refrain from admitting students who are obviously suffering from severe mental illness, or toss them out if they somehow slip through the admissions process, and stop filling the curriculum with garbage courses like “Contemporary Horror Films” where students get academic credit for reading and talking (though Cho didn’t) and writing (though Cho did so only incoherently) about fictional gore and mayhem.
Prior to the crisis event, I don't think there will clear indicators as to who is so dangerous that their lives must be controlled by the government, and those who are simply outside the norms.
For example, how many students do you think are attending Virginia Tech today who have had counseling sessions for reasons of emotional instability? Five? Ten? One hundred? I would bet it is closer to the latter.
The truth is that the vast majority of people with extremely serious mental problems never hurt anybody, including themselves. They just live very troubled, dysfunctional lives.