In the sense that the "acceptable" punishment is way out of line with the crime--summary execution with no trial for stealing $150 or less--yes, I stand by my comment that Texas laws in this case are close to Islamic laws.
I do not believe anyone would claim that execution was an appropriate punishment. From what I have read the death was not intentional and my guess is that the guy would have loved a chance to relive that moment and make a different decision. I would guess that his ordeal is a good example to all that using a gun has very harsh consequences even if you do not go to jail. In this case his risk of a conviction was huge. However, it must be acknowledged that the thieves put themselves at risk and they are just as responsible for what happened.
Yes I can disagree, and in this case I do. If a 6 year old swipes some candy from my house at night and runs down the street I can shoot the robber (hyperbole of course)? Of course there is a gray area, but to me this example as far as I have seen the arguments, is not moral. Legal in Texas--apparently so; but not moral.
I sympathize with your concern here to a degree. The problem is where do you draw the line. Obviously a child stealing a candy bar is not justification. But an adult stealing money? How much money is enough? I think a jury is a good judge of that. A good example is the guy that shot his neighbor while he had a camera on recording him saying he is in fear of his life. A jury made the correct decision and threw his ass in jail. It is not possible to write a law that is perfect in every possible situation.