Because the other major alternatives are

(a) service jobs that are a zero sum game of people inside the same country of circle-servicing one another,

(b) jobs like scientist, software developer, etc, that by their nature require few people so wont be increasing anytime soon either (and eliminate other jobs)

(c) UBI -- good luck with that.

Furthermore, if white collar jobs are "shrinking" means they should be irrelevant, manufacturing jobs are shrinking means they should be lamented?

Lastly, what if increasing automation means that manufacturing jobs will inevitably go away regardless of how anyone feels about it or complains about it? What do you propose to stop that? Manufacturing output of the US has consistently increased despite any variance in the amount of people it employs or the state of the rest of the economy.

I propose a society where mankind DECIDES about what kind of jobs it wants to have (or none if they please so), and they are not dictated to it about the mere availability of some technology.