Humans can inflict unimaginable horrors of cruelty upon animals. Thankfully other humans — better, kinder, compassionate humans — can lift those animals that suffer at the hand of the unscrupulous out of deplorable conditions and into a life that, though not what natured intended for them, is the next best thing.

The documentary film LION ARK chronicles cat rescue on a grand scale. BIG cats. As in African lions held captive, tortured, neglected, underfed and abused in all manner of ways by the illegal circus owners of Bolivia. Even after...