Remember, it's very important that you demonize people with mental illness while also shaming them for receiving treatment.
What makes you feel that way about mental illness? Would you like to talk about it?
It should be concealed and they should not be treated so that they can't think of harming others.
Not all mentally ill people need treatment for it, and you shouldn't disparaging people due to their mental illnesses in the first place. How would you feel if someone wanted to make you feel lesser because of things out of your control? You're going to be very lonely if you continue speaking this way about others.