1. The animals in captivity age give all they require in terms of food regardless if they perform or not. The food they are given for performing tend to be a preferred food or treat. Bottom line, the orcas are never sent to bed without dinner.
Correct. They were denied food for non-performance at Sea Land. There is no evidence of Sea World doing this.
2. A fairly valid point, but how do you define confined space? Looking at the range they exist is the wild is a false equivalency as most species "range" is dependent on their food sources. They go where the food is. When a constant food source is found, most species range will reduce drastically.
An unanswerable for sure. But they do travel 100 + miles a day in the wild and don't live as long in captivity, which is a bad sign since for most animals it is the opposite.
3. If suckling pups were being stripped from their mothers you would have a point, but that is not what is happening. It looks like most are separated at around 3-4 years of age if at all. To know if that even begins to be bad we would have to compare it to what happens in the wild. Wheat is the average age of an orca when it leaves the pod?
They live withe their mothers for the entirety of their mother's life. A quote from wikipedia - "Unlike any other mammal species whose social structure is known, residents live with their mothers for their entire lives. These societies are based on
matrilines consisting of the
matriarch and her descendants which form part of the line, as do their descendants. The average size of a matriline is 5.5 animals."
Some people can't be rationalized with.. either due to emotion or simple lack of objectivity. it's best to just let them talk to themselves and then they bore of it and go quiet. The prophet needs responses just as much as the troll does to give their message legs, visibility, and energy. 
