The world would be a better place if more people had to work an underpaid service job at the start of their employment.

I agree with the sentiment, but ideally people should not have to do X to empathize with/respect people who do X. It's sad that they have to, but I wish people just learned empathy/respect better.

It can be a crash course in patience, empathy and humility

Taking out frustration on employees who have zero control over these broken machines is just wrong

Some people have internalized that underpaid employees get what they deserve (i.e. they're not actually underpaid at all) and I believe that's one of the factors that leads to the abuse.