If I understand well, you believe Allah is the most powerful being in the universe and he gets to decide when people live and die. So when someone commits a murder, that person is taking Allah's place in making that decision, messing with his plans for the victims life. After all, Allah had decided how long that person was going to live but that's not going to happen anymore because the murderer took their life.
Does that mean murderers are more powerful than Allah? If he allows them to decide when people die, they must be, but that would invalidate what you just posted.
If Allah is the one deciding when people live and die, how come he doesn't? Why does he allow terrorists and other forms of evil to make that decision in his place?
Please explain.