"Its been fine in the past, and we've always found new jobs to replace those lost for people!" is great, in theory, except for the tiny bit where we aren't finding new jobs to actually replace those lost. Sure, we have been scraping by and finding jobs for people to do, but this is not actually the same as replacements for said jobs. True replacement jobs would have continued on with similar benefits and standings as what were lost.
True replacement jobs for the 50's and 60's manufacturing positions that the US lost would be providing young adults with the ability to afford personal transportation and buying property... What is the home-ownership rates of mid twenties to thirty year olds in North America today? What was it in the 50s? How many are buying brand new cars off the lot vs getting by with a used car or no car at all?
Automation is also posed to obliterate the usefulness of human employment in sectors like transportation and shipping. Call centres and customer support sure aren't immune. (Ever used a company's 'chat support' rather than calling in and waiting on hold? Would you be overly shocked to find out that most of what you see might not have been an actual human doing most of the work, but rather a human guided bot processing half a dozen clients at once?)
Humanity is inventing tools to replace ourselves at a far greater rate than we're inventing new worthwhile things for humans to do to "Prove they deserve to exist".
Maybe it is time to go back and rethink this idea that a human should sit in some job for 40-60 hours a week in order to 'prove' they deserve a place to live, food to eat, and clothes to wear.
Did you take a vacation this year? Why do You deserve a vacation more than the guy who asked if you wanted fries with your last fast food order? (Oh, and his job is fast coming to a useful end. Why would I even want to stand in line and tell another human what I want when I could place that order on my phone before I even get there to pick my food up?)