Depends on your beliefs. There are people who believe in being judged for every action by an almighty force or being, so it's probably not absolutely perfect. I might be smitten in my next life for it.

It's interesting to read the comments, as there are people who are like

I sometimes don't return the cart and I attest myself to not be a bad person. Therfore the test is bullshit.

But then they behave like a dick in the comments; showing involuntarily that the test is a good metric.

So I think even a post about this test works like the test on a more meta level.

Typically parking lots are filled with cars, and I need to drive between the parked cars. If a cart is in the way it makes it harder for me to leave, just saying

We have now this in Migros and Coop:

Place it in the stack at the checkout where you unload it and go. Kinda breaks that test. And a headache less for the clerks.