I don't think you can really take a stance with regard to protecting your life, but you can take one with regards to property. Here's my view:
If the person facing you is set on killing you, then you should do everything in your power to protect yourself, but that doesn't mean you have to kill him, if you can prevent it. It you do kill someone who is a threat to your life, than there is nothing you could do about it, and that's they way it turns out.
If another person is trying to kill you for whatever reason, you have the right to live your life just as much as they do theirs. But if a person tries to take your life willingly, they have, in a sense taken a stance that your life is less imprtant than theirs. Thus, you have the right as an individual to protect your own life.
With regard to property, things get a bit tricky. Property in today's world can mean a lot of things, and some things are worth protecting, while other proterty is just stuff that doesn't really matter.
If you talk about a country, it's your right to defend your land from aggressors trying to take it away from you. However, this statement I just made is so complex that I don't think you can ever debate it fully and ever find a real solution. It's so complex, as per who 'owns' what, and who had the rights to this land or that land.
I can't give a complete answer at this point, but I will say that anyone who sits back while an agressor takes over their land should not sit by idly. And this applies to everyone. It creates messed up situations, no doubt.
The only solution is people listening and talking to eachother.
But this is Earth afterall.
But that doesn't mean we shouldn't keep trying, because it is worth it.