It seems he was sentenced not for stealing ribs, but because the threatened the store owner that confronted him, which is, in fact, a violent act. It also appears he was somewhat of a habitual offender, having been convincted of various violent and non-violent crimes many times previously.
The sentence is somewhat harsh (eligible for parole in 12.5), but your comparison to the Taliban is absurd.
EDIT:
somewhat harsh in relative comparison to normal American sentencing standards, since the goal is apparently to single out Texas as some horrible place where sentencing is too harsh. I will now point out draconian three-strikes laws in other more progressive states that would have had him in jail for life.
Make no mistake, I think American criminal courts and sentencing are too harsh in general and our prisons are horrible travesties of justice. But the singling out of this state is what I'm calling absurd - all of American criminal sentencing is broken.