In the wild, the most well-studied killer whales stay with their mothers' pod for life. Those pods consist of brothers, sisters, aunts, uncles, grandmothers - for these killer whales, family is all that matters. Each family has their own language, diet and culture and all this family-specific knowledge is passed on from generation to generation by the older females in the pod.
In the included video, trainer Wendy Ramirez uses a lot of dramatic facial expressions to show us just how horrified she is at the thought of babies being separated from their mother, but she never answers the question: just how does SeaWorld justify separating families? She doesn't even explain how or why mothers and their offspring, brothers and sisters or aunts and uncles stop being family.
We think the real answer is SeaWorld simply doesn't respect any family bonds, and considers any other killer whale to be just as suitable a 'pod'member as actual family members:
We provide our animals with restaurant-quality fish, exercise, veterinary care and the company of other members of their species. (emphasis added)