No offense, Nam, but that's not valid reasoning. Sure, if your house burns down, you won't be able to recover that house...but you can get a replacement house (or, at least, residence). If someone steals your TV, you may not recover the TV, but you can get a replacement TV. So on and so forth. And please, don't try to tell me that a person can't replace something that's lost or destroyed. Because that's silly. They certainly can replace it. Whether they're willing to take the necessary actions to do so is a different story.
And while it's true that there are sentimental items that aren't easily replaceable (such as heirlooms), it's the sentiment that matters, not the item itself. So while I would be less likely to condemn someone for acting irrationally because of an heirloom, I still don't consider it a justifiable reason to kill the other person. Because you can neither recover nor replace a lost life.