I was being a bit pedantic. When she says "don't lump the mentally ill together with evil murderers" I think she means "don't lump [psychotic] people in with evil murderers", which I don't disagree with. However, not all sociopaths are evil murderers. I would even say it's wrong to lump these mentally ill sociopaths together with evil murderers.

Are we talking about psychotic people here or sociopaths (psychopaths)? The two are vastly different. Or are you saying that neither psychotic people nor sociopaths are necessarily evil?