MAID isn't available for people with mental health issues. It's mainly for people with debilitating terminal diseases. They almost did pass it for people with mental health issues though which is frightening to say the least.
Even then, there are cases of doctors, not nurses, but full on doctors, raising the issue and trying to push people who don't have terminal illnesses onto the program
Last time I looked into this was when /r/PoliticalCompassMemes was posting about this on reddit. I couldn't find a systemic issue, just instances of bad and unsupported nurses suggesting it at a bad time. Not even necessarily pushing for it.
I'd be happy to look at sources you found this info on