Psychosis is fine. Psyhopathy, on the other hand, is not.
killing is good. Not caring about killing lives is pure evil.
Psychosis is fine? I don't think so and Lakeisha will probably be diagnosed being psychotic due to the unbearable stress of trying to care for a 3 year old child, living in a car and not being able to sleep day or night. Until she is proven to be a serial killer who preyed upon multiple victims over time, I think this temporary breakdown is due to psychosis.
OTOH Jeremy might be closer to being a psychopath. After all, he does have a history of violence and has exhibited behavior consistent with psychopathy.