This appears to be the modus operandi when (dangerous) animals escape. The latest is a rare snow leopard that escape its pen in Dudley Zoo when it was closed. They are listed as vulnerable by WWF. This has also been the fate of lynx, red deer stags, wolves, wild boar and many, many others.
It dismays and disgusts me.
My take on this is that if a marksman/woman can get close enough to fire a lethal shot, and keep the public safe at the same time, then he or she could and should use a tranquilliser dart. There are plenty of scenes in wildlife documentaries where super large animals are brought to ground in a few tens of seconds. They do not get enough time to do any real damage as they are so groggy from the instant the dart hits.
This "shoot to kill" policy has to be looked at.