You see those two things as different?
Yes, murder is unlawful/unjust killing. God can have just reason for killing, because He has given life.
So do our parents have the right to kill us when they're tired of us?
What kind of morality is this?
Parents don't give life.
Why is it immoral for a guy to kill people but then it's not immoral for us to kill that guy? It's too hypocritical to me.
Ok, and I am not saying you should kill anyone.
Person who murders someone, gives the same right for others. There is no way how he could defend himself after doing so. Those who give the death penalty, give the same right for others to give death penalty for same reasons. This means: Person who has given death penalty for a murder that killed and innocent person, can get also death penalty, if he also kills an innocent person.
I don't think anyone lives forever. I'm talking about this one life we know we actually get - that we're living right now.
If I were God I wouldn't have created evil in the first place.
Evil is not actually created. Evil is like emptiness or darkness, nothing really. Evil is lack of good, when good is not around, evil is in place. Evil became possible, when God allowed people to reject Him and when people were expelled to this first death. And this is possible, because people wanted to know evil. So, this "life" is actually a short lesson about good and evil, which is why we can experience also evil things.
But, please answer to this question: Should evil people live forever?