Martin is shown to be a very broken individual, mental state slowly dwindling as the series goes on. His horrid actions driven mainly by his wife’s infidelity, and his brothers betrayal. Desperate to have the perfect family, a family that’s genuinely his own. Though he’s shown to be someone who’s genuinely sympathetic and can be reasoned with at first, due to his personal issues and the public’s scrutiny (and demonic dealings) he becomes more angry, aggressive, and he takes it out on his family.