How exactly do you think it impacts other people shopping at Walmart when someone steals some food there?

It comes from Walmart the billion dollar corporation.

Walmart, which steals from the pockets of all their employees in the form of wage theft, and steals from us in the form of tax avoidance, paying employees just enough so they qualify for foodstamps and Medicaid (programs which come from our tax dollars) and pay to show them how to sign up for those programs instead of paying them enough money for groceries and insurance (which they have way more than enough to be able to do). Money they have by stealing customers from small business by underpricing for a loss until Walmart is all that's left so they can raise money and steal from those customers by inflating prices for profit of the owners.

You only think it's simple because you don't actually know the problem.

If you hold a light in a dark infinite room, with all the things you see being the things you know and the circumference of the circle of dark around you as the things you don't know that you don't know,

Your light would be a dim candle that doesn't even let you see enough to know what the problem is, let alone that light being bright enough to know the answer.