Morality question (re: Joe Horn incident)

[CT_Progressive]

Note: Please read this entire OP, it goes beyond Joe Horn. Thanks.
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For reference, he is the guy that shot and killed two burglars who were robbing his neighbors house in Pasadena, TX.

Question:
- Is it immoral to purposefully put yourself in a situation that *might* endanger your life, just so that if it does, you can then defend yourself legally?

In the case of Joe Horn, he purposefully walked outside his house where the burglars were. When they saw him and ran at him, he shot them. But, if he hadn't walked outside, that might not have ever happened.

Lets use another example:
- Two men are just finished raping a woman in an alley, and are starting to leave the alley. You purposefully stand at the end of the alley, doing nothing, taking no action, just standing there, letting them see you, and letting them know you saw them. They then pull knives on you, and you draw a gun and kill them.

Is what you did immoral? There was no evidence that the men would draw knives and attack you. They chose to do that of their own free will. Yet, you knew there was a chance.

Another example:
- You go to a place where drug dealing is common. You choose to simply walk down the street, knowing that you are armed, and that this is a bad place to walk down the street. A man jumps out of an alley with a knife and demands your money. You draw your gun and kill him.

Is what you did immoral? Again, there was no evidence that you'd get attacked by anyone. Yet, you knew there was a chance.