That's a personal choice. I'm not willing to kill over someone stealing my car. If you're ok with it then that's your deal.
I'm not saying i would kill someone for stealing, but in some cases I can understand why people do it
Say for instance, you have 1 vehicle in the household, and struggling to make it by. If someone were to steal your car, you may not have a way to get to work, leaving you jobless, your bills would not be able to be paid, and could leave you homeless.
Would you want to be homeless and lose your children to cps because you let some asshat steal your car when you could have stopped them?