I agree it is a shame. But that doesn't change what's required today.
If you raise a cub in the city ( very dumb idea, agreed) and then it's start maiming people in the City when it got older. Sure, it was dumb and irresponsible to have raised a wild animal in the City. But now that it's loose and killing people, the goal is to neutralize it before it causes any more damage.
Did you raise this hypothetical cub in the full knowledge it would kill? But you still helped it get big and strong anyway? Because if so you should probably go to prison.