sven:
For example killing is wrong except in
self defence is the same as saying that the effect of saving ones own
life is a preferrable course of action to letting youself be killed.
I'd like to start by saying that there are numerous ways to argue for something called X. But just because you agree with X, that does not indicate what argument you are using. In this case, the X is "killing is wrong except in self defence".
So no, that is not the same. Self defence can be argued using UPB. The attacker has expressed a preference for violence against you, so he/she should logically extend that principle to himself.
Invading another country is wrong but if there is a brutal dictator
who is taking over and is going to start slaughtering his people then
its right because the effect of not doing it is worse than abiding by
the principle. Again the end justifies the means.
What are the ends and why is that end preferable to another end?