All the people employed by the government and blue collar workers? All the entrepreneurs, gig workers, black market workers, etc?
It's easy to imagine a world in which there are way less white collar workers and everything else is pretty much the same.
It's also easy to imagine a world in which you sell less stuff but your margins increase, and overall you're better off, even if everybody else has less widgets.
It's also easy to imagine a world in which you're able to cut more workers than everyone else, and on aggregate, barely anyone is impacted, but your margins go up.
There's tons of other scenarios, including the most cited one - that technology thus far has always led to more jobs, not less.
They're probably believing any combination of these concepts.
It's not guaranteed that if there's 5% less white-collar workers per year for a few decades that we're all going to starve to death.
In the future, if trends continue, there's going to be way less workers - since there's going to be a huge portion of the population that's old and retired.
You can lose x% of the work force every year and keep unemployment stable...
A large portion of the population wants a lot more people to be able to not work and get entitlements...
It's pretty easy to see how a lot of people can think this could lead to something good, even if you think all those things are bad.
Two people can see the same painting in a museum, one finds it beautiful, and the other finds it completely uninteresting.
It's almost like asking - how can someone want the Red team to win when I want the Blue team to win?