Let's be random.

[Oldman]

Oldman...
If anybody wakes during the night and somebody is raping or killing their loved ones they should do anything they can up to and including killing the intruders. I am 100% for that. There is no doubt the intruders deserve it.

But......

If the case is not 100% and there is a element of doubt.... Should the person still be put to death?

There is the trial and all the appeals that are put forth. There will always be doubt, you will never convince 100% of the people. I agree with your example I would do the same, but you know somebody would but forward the Idea that you could have done something other than kill him.