The court has a duty to see that a defendant has effective counsel. Bill of Rights. I think a lot of judges would refuse to let a murder defendant who did not have a law degree and courtroom experience defend himself. We shall see what happens.
He waived right to counsel. However the defendant could later try to claim mental incapacity, thus he couldn’t supply himself his own rational minded defense. That one might fly but it may not get him out of prison; just a reduced sentence with stipulations for mental treatment.
They probably have a duty to ensure that it is available, he has that right. But as well know some people are ignorant. Beligerantly ignorant. Whaddaya gonna do?
If after repeated exhortations counseling and advising “this is a really bad idea, and here’s why”, and he insists, then that isn’t their problem.