Honestly, PETA is such a problematic organization that they hurt any argument similar to Carole.** Carol's cause is noble even if she is deeply unlikable. If the doc was really supposed to be an expose of the big cat world a la Blackfish, then they should have footage from someone else. Some experts in big cats to explain why random people owning, breeding, and selling these cats is horrific.
**PETAs stance on the tigers in these zoo's is probably along the lines of their views on pittbulls.