No.

If the carjacker had a gun of course they would be justified...self defense. Otherwise back up over the bastard.

In this case, definitely. He had a knife to the car owner's throat telling him to give him the car or he'd kill him. If someone pulled a knife on my family or me, whether or not they were stealing my car, I'd shoot him.

I think the answer is yes in but only case he is using a weapon. His next carjacking may result in innocent people getting hurt or killed.

Yes he did. Any one that says no hasn't been in that situation.

Today's laws have stated that if your life is in danger in any situation...you must make a decision based on the believe that your life or someones life is in danger to take another persons life. If there was no knife involved and they stole the car...and you killed them...you would go to prison for manslaughter...but being that the life was in danger it was justified.

yes as long as you dont kill him or along as injuring him doesnt mean that you injure any one else

Yes, and it doesnt matter if you kill him or not. If someone is going to steal your car then they have to be ready to face the consequences if you are armed.

Each case is different. I wouldn't say that there's any blanket justification, but the case you linked to was a potential self-defense to threat of deadly force. And it's by no means a slam dunk. That is, a case could be made (but not in Houston, I think), that the victim could have just handed over his keys and avoided any violence at all. That is certainly a presumption that some prosecutors in some parts of the country would make -- and in some cases they might be right. For example, what if in the heat of the moment the victim had missed shooting the attacker and instead shot wildly and killed a neighbor. Completely accidental, of course, but is it "justified"? What if the knife had not been at his throat, but just "shown" from a foot or two away? I think a case can certainly be made for the defense that with a gun in the car, the victim couldn't take a chance that the attacker wouldn't take the car, check out the registration papers inside and drive to the victim's home (if he wasn't already at his home) and threaten his family ... with the victim's own weapon? No blanket justification, and no slam dunk "obvious case of self defense". But I'm glad he shot the bastard, if the story is accurate. (That's key, too, isn't it: "if the story is accurate". That's not a certainty, either.)

just like a horse thief or cattle rustler could be shot or hung after his trial, a car thief should also be shot. And to threaten a man with deadly force, a knife or any weapon, justifies response in kind. If this had been a woman driver would anyone be asking the same question?

if they gained entry to the vehicle, and there were passengers inside, it might do to shoot them in the leg or arm to slow them down.

if he had a deadly weapon

i would hope so. But knowing the law and how stupid it is, I will get sued by the jackers family and loose alot of money and have to pay them till i die!

I would say yes as long as you live in a state that allows citizens to carry concealed weapons or you have a permit to carry a concealed weapon and your life was in danger. I guess you could shoot the carjacker with his own gun if you wrestled it away from him and shoot him in self defense. But I would assume that if you shoot someone with a weapon you were carrying that was not registered and did not have a permit for, then you might get slapped with manslaughter.

In the state of Texas you can use deadly force to protect yourself and your property!

In many states crimes against property are not justification for deadly force. Texas is an exception to this rule and the car owner should be alright with the law. Maybe the security systems in cars should address this issue. A voice recognition system similar to that used in cell phones can confirm the driver is authorized after a car is started. Shortly after starting the car might ask "who is driving?" and if you state your name with the correct voice pattern all is well.

Certainly.