Absent the statement from these two that MB did the shooting, what evidence have you seen that the gun was ever even in his hands?
No fingerprints
No gunshot residue
No DNA
No footprints (due to rain and scene trampling)
Missing cartridge
No audio from the phone call
No evidence as to when the gun was removed from the safe (except the victims talking about a “missing gun” on Facebook)
So basically you think that because he had access to the murder weapon (maybe?) he must be the murderer.
I suggest you not quit your day job if this is how you reason through scenarios.
Also, calling jurors “insane” is definitely not professional conduct and it disrespects the judicial process. A lawyer’s job is to ensure that his client’s rights are protected to the full extent of the law. Insulting a jury who found against your client is not ethical.
But if you need a reference, it is a violation of the Model Rules of Professional Conduct, 8.4(d) “it is professional misconduct for a lawyer to engage in conduct that is prejudicial to the administration of justice.”