And you are assuming that there isn't a why. If our universe is just a simulation, then we might be able to detect information outside the universe, just as computer processes can detect whether they are running on dedicated hardware or sharing hardware with other processes.
While far-fetched, we might communicate with the beings running the simulation. This would be science - based on measurements. To date we have no evidence to explain "why was the universe created?", but "It just was" is a defeatist answer that could keep us from looking deeper.