A friend of mine is a veteran with PTSD and his Jack Russell terrier is his emotional support animal, and it really seems to be helping him.
We're not disputing that there are people, especially veterans, former first responders, and others who do genuinely have PTSD, nor that they are helped by their animals.
It has, however, in the waning days of Obama bureaucrats, become a popular thing people claim to have and they are often supported in their claims by social workers and others who stand to gain caseloads (which lead to relevance and promotion). It is an exploitative charlatanry that keeps their budgets up and their ranks swelled, and what's more, it's easy.
With Obamoid unemployment levels, disability claims went up sharply after the 99 weeks of unemployment extensions ran out, which helped cook the books on who was and was not working and why.
So there are a number of motives to claim (and push) such claims among people who just might not have had anything near the experiences those who have been in deep poo have had.
Still, the subjective nature of the claim makes it tough to weed the slackers out of those who do have a real problem, and, FWIW, I'd rather end up letting some slackers slide than have even one veteran who needs help be denied.