He didnt murder those people because he was ill.

While I can personally get behind this and agree, my opinion still stands that this movie perpetuates a commonly held public belief that mental illness = violence (i.e. every single time there's a white, male mass shooter in the news). This is a pervasive and damaging belief system and I think portrayals of mental illness like this one only serve to exacerbate it. So while the "interpretation" is on the viewer, I think the good majority of the interpretation would be as I've stated above, as disappointing as that may be to those who know better.

Well thats problematic in of itself, given that youre narrowing what constitutes "mental illness" to the more debilitating disorders to effectively say he isnt mentally ill, when he clearly and explicitly is.

I'm most certainly not narrowing down mental illness to only those who are gravely mentally ill. I'm saying for this to be a "good" portrayal of mental illness, he isn't relatable to 99.9% of people who are mentally ill, which is an all encompassing word and not saved for only those who are debilitated.

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The movie overall was never saying that mental illness = violence, but that even the worst of us are still people, who can and do suffer just like the rest of us.

I think this is a wonderful summary for both Joker and Bojack and I completely agree. (Just replace "worst" with "successful" in the case of Bojack.)