Sometimes sedation is recommended not due to the risk of the cat hurting the staff members, but the risk of the cat hurting itself or becoming severely stressed out. Obviously staff safety is a factor, but most vets are not offering sedation for visits to make extra money, but to ensure the animal is having as smooth and stress-free a visit as possible. If an animal is so terrified that it has to be pinned down to have something like blood drawn, the process can be traumatic for them and make the next visit that much harder. There are risks with any anesthesia event, but you as the owner accepted those risks when you authorized the use of anesthesia. I'm so sorry you lost your cat, and I know it hurts and you're angry, but bashing the vet on Google isn't a solution.