This is the reason to put it down and this is why it will probably be trapped and put down. The cubs will be cared for or if they are big enough, be relocated. Some of our "cubs" are two year old bears that can easily survive on their own. Once a cub is above 60lbs (1yr old) they can be independent.
No one is willing to take a chance that the bear might do it again, there will be too much liability for PA Game. There is a one strike your out when it comes to bear attacks and humans regardless of the situation. This is the same thing Alaska game does when a bear attacks a dog at a residence.