I totally understand how you feel. Many of your assertions have a basis however the confirmation bias of the group you're talking to won't allow them to see it. We live in a divided world my friend, in all sorts of ways.
You know a lot of people would rather trust an orthopedic butcher than take personal responsibility. I know a lot of doctors who wouldn't have back, knee etc surgery. I'm with you. Carbs and sugar cause a lot of trouble.
I am not sure there are thousands but I'll let you have that. Data, not anecdote. Arthritis can be alleviated by many other things rather than going under the knife. Plus people expect doctors to do it all. I just keep exercising, take supplements and maybe having a healthy 94 year old mum has something to do with it. But as I said, happy for you to have your view.