That doesn't mean that they would have power over the policy, though. They might just get policy that they're expected to carry out, no questions asked.

In an extreme scenario, a store manager may bend the rules, but they wont hold their job for long. The company would probably prefer to replace them with someone who will follow company policy.

Yelling at people for just trying to make a living also is a bit harsh. Not all deeds are excusable because they provide people with income, but managing a Kroger is not really a bad thing.