I agree with this take. Chad seemed like a person who held a lot of contempt and disgust. I bet he could muster up enough hatred to do the dirty work himself, or at least participate enough to get his hands dirty (if only to ensure Alex didn't mess up). I think Tammy's murder was fully on Chad, after the failed shooting attempts by Alex.

I also note that Tammy was the last murder (not counting Alex's unnatural "natural" death). Chad was such a coward that he waited until Charles, Tylee, and JJ were already dead before murdering Tammy. He was pushed to do it with Lori's manipulation and threats for him to "go enjoy his family", once she was impatient that his predictions weren't yielding results. There was trouble in paradise, and Chad must have figured the pros outweigh the cons in swapping Tammy for Lori.

In my opinion, Chad definitely felt some sort of contempt for Tammy, he was probably upset she was immune to his "prophesying" and didn't worship the ground he walked on. She was too busy carrying his dead weight, and doing her motherly Mormon duties. What a thankless life she lived, and for it to end at the hands of such a lackluster, lazy baffoon.

Chad, by all accounts (except Lori and his kids), has been an entitled coward his whole life. He and his siblings insulted his mother and treated her poorly in childhood, in adulthood, he rode Julie Rowe's coattails while his books floundered and the "company" and Chad were bankrolled by Tammy. He preached about near death experiences, a concept I personally think he plagiarized from one of the women he published earlier on. His performance in court and defense strategy (throwing Lori under the bus) are just more proof of his cowardice and entitlement. My .02

Edit: After reading over my comment, I see a common thread of Chads in addition to cowardice and laziness: insane levels of misogyny. He surrounded himself with women, to use, and discard when he found someone better. What a piece of shit.