<respectfully snipped for space>
His biggest failing is that he wouldn't give up on Jodi Arias. When everyone else saw her for a manipulative, vindictive Beeyotch, he still saw good in her. She milked that for every last drop, then when the good will was gone, (I believe) she rolled him and left town.
He threatened to end her milk and honey days being the Hottie Biscotti of Prepaid Legal, which was her only connection to the Next Man. If you look at her life, this tick jumped from man to man, roommate to roommate, and that's how she rolled. Prepaid Legal was a bonanza for her parasitic lifestyle and Travis had no right to take it from her.
The foreman has limited information and is under the delusion that he has MORE information than the public. He is obviously driven by ego and a feeling of power, becoming the benevolent fatherly figure who, from day one, could not even believe this young "girl" could do such a gruesome thing...why then she must a had a good reason...
Too bad the jurors didn't put him up for perjury during jury selection.