I tried to argue something similar with my brother that because he suffers from NPD he would be incapable of aiding his defense if prosecuted. I was however convinced just because he is a narcissist and would lie often, that did not in any way prohibit legal proceedings.

I suspect incompetence will not be excusable. Better would be my dog bite me and I have rabies.

ignorance is the enemy
without equality there is no liberty
America can survive bad policy, but not destruction of our Democratic institutions