 They're sure you'll be paying with your money. This guy who bought an energy drink called the clerk over to open the refrigerated case. And then they have to watch you get it out. Sometimes they guide you to the cash register, and then you buy it, and then they're done. They have to lock it again. He and other shoppers support the store's right to protect their merchandise. I can understand them having to lock things up. Sometimes you have to do what you have to do. It's an inconvenience for those of us who aren't thieves.