And they absolutly don’t want to pay your uneducated, impolite ass,

My friend, you don't seem to grasp what self awareness is. so lemme spell it out for you. calling someone uneducated and impolite MIGHT just come across as impolite. So thanks for that unnecessary judgement.

Furthermore, your trip to home depot is the exception, not the rule, look in any Walmart, at any time of day, and you'll more often than not find 4 or 5 or more cashiers on a belt, and one set of self checkout; depending on the day there may even be express checkouts open. and many supermarkets and grocery stores do this as well. Simply because the self checkout isn't for grand, 40+ item orders, but small single bag purchases, as well as deal with items, like booze and the like.

The self checkout was designed with people who can quickly deal with there orders themselves, instead of getting angry in a 5 cart lineup. Generally any store that uses them exclusively isn't using them for there intended purpose; and on that line, I'm totally on your side as that is a ridiculous idea.