Cho was not on the street, and he had not comitted any crime. Harmless people write incredibly disturbing and violent things all the time. Should Quentin Turentino or Bret Easton Ellis be forcibly incarcerated?
When you start making laws to crack-down on the supposedly mentally dangerous, you are headed down a slippery slope. Bear in mind that the experts in the mental health professions tend to be liberal. For example, many conservatives believe that homosexuality is a mental disorder, just as many liberals feel the same way about "hate speech/hate crimes." Are you prepared to undergo forcible reprogramming the next time you call somebody a faggot?
Bear in mind that Cho was evaluated and deemed a danger to himself, but not others.
This is what gets me. It seems while (generally) conservatives are fighting against increasing gun/weapon restrictions/laws, they are calling for “better” incarceration of “mentally ill”. This is definitely a liberal-type thing to call for more laws, only liberals usually want only criminals and mentals unleashed, and everyone else locked up for things such as not wearing seatbelts or bicycle helmets or for putting recyclables in the trash. Definitely have to be careful of calls for incarcerating allegedly “mentally ill” people - SINCE IT IS *NOT* CONCRETE what is “ill” any way.