At all the Costcos where I live, there is staff rather than a machine at the very front door that prevents entry without a membership, even to the food court. I think it's much more likely that their policies vary from country to country, rather than their being a rogue sect of policy breakers in my city. I don't think my view of Costco based of the customer experience I've had there is any indication of lunacy, I've had a bad time there, and so it's okay I don't like it. Just like it's okay that you do. I'm glad you've seemed to have had a more positive experience, and they definitely do treat their staff better than some. My issues with subscription based models, and land development with Costco remains though and I don't think my opinions changed.
I hope you have a good day and that people's differing opinions on Costco isn't nearly so upsetting for you in the future!