Normally I would agree with you, but OP is living in the environment created by the roommate's symptoms. This is obviously uncontrolled or, at best, extremely poorly managed mental illness and it is not reasonable to expect OP (who is this person's roommate, not explicitly a friend, certainly not a family member, and definitely not a partner) to sacrifice their own wellbeing in deference to this person's dysfunction.
OP obviously has empathy for this person, but is clearly at the end of their rope, and your pontificating and language policing from the outside doesn't actually help OP or the roommate in any way. I work in medicine, I deal with a LOT of mental health patients, and your comment here doesn't read as any kind of advocacy for people suffering from mental illnesses, it just reads as virtue signalling or sanctimonious tone policing.
I don't think this will be a conversation you will be able to have with him, but it's probably something you need to have for yourself for your own sanity. There is the adage that "your mental health is not your fault, but it is your responsibility", that I think is very applicable here. I know that the manifestations of his mental illness at this time are damaging your quality of life, but I think that you are suffering additional, semi-self-inflicted harm by internalizing any amount of responsibility for his behavior. It is a bit like intentional cognitive dissonance, but I think you would benefit from divorcing yourself of any sense of responsibility for fixing this situation.
There are some good suggestions in this thread about strategies for set cleaning times with reference images of what each room is supposed to look like, and to some extent, mild parenting techniques to get some sense of order in the house. If I were in your shoes, this is the list of things I would try to implement:
Set deadlines for cleaning tasks
Make a list or a calendar on a whiteboard in the kitchen
Clear delineation of responsibilities
(The strategy for dishes can be variable, I just feel like dishes are a good example for figuring out household responsibilities.)
Also, make it clear that his actions are harming you. It may feel dramatic, but it's true. And I think a way around the bluescreen issue is to write a letter explaining your needs and how his actions are affecting you. I would recommend hand-writing this because it will appear more personal, and be less easily dismissed. Putting it in writing makes it so that he has a physical object to refer to when his mind tries to edit out the uncomfortable thing. But still give him the letter in a conversation. I would start it with saying:
This is my advice from having had difficult roommates and friends that don't deal with their mental health, and from the perspective of a medical professional. I'm a medical student, but I've done a lot of work with mental health and substance use disorder patients and I always try to work with folks to find strategies that work for them to improve their quality of life. I see medications as an adjunct to building accommodations for oneself, but I always emphasize that the medications are exactly the same as medications for things like high blood pressure. For some folks, there's a physiologic dysfunction that you can't "life strategy" your way out of, and you just need to get the chemicals in your brain to behave properly so you can function.
(This ended up longer than intended, sorry for the essay)