My mom must have been a different type of Alzheimer’s patient, because she never got angry. Just forgetful, confused, and repetitive, yes. But always a smile and welcoming. I do think my dad helped keep her somewhat centered. And that was her nature. When he passed, some of that “centering” was lost.
It seems to me that much of Tom’s misdeeds happened long before the accident that may have impacted his brain and behavior, so I’m not excusing him.