Fortunately for us, they used another customer of ours instead, so we didn't lose any work, but all the employees at the plastic place no longer work there. Our other customer invested in automation, and I don't have to tell you how many jobs were lost because of that investment.
You completely ignored that the $30 the customers saved in your example was greater wealth for Wal-Mart's customers. Wherever that money went created jobs.
1) WalMart resells items. They don't create any value. So when they saved $30, they still got exactly the same things. They were wealthier.
2) The work as you pointed out went somewhere else, it didn't go away
3) The automation was going to happen anyway
4) Yes, the company that went under lost. But consumers a whole benefited and the economy overall benefited. Change is constant in capitalism. You win by embracing it, not fighting it. That's what we did as a country that made us the greatest economic power on the planet. Now we've succumbed to fear and fight change and have doomed ourselves to Europe's fate of stagnant growth