Sure, if what they were asking for is a jobs guarantee to go with increased technology + automation, that'd be reasonable. That's not what they're asking for.
What they're asking for is like if the candle makers union tried to get electricity banned because it threatened their jobs. And worse if they somehow had a monopoly on all lighting and said "everyone has to live in the dark until we get a 80% pay raise."
Btw the union president is mob connected, makes insane money, has a yacht and drives a Bentley. This isn't fighting for hard working Americans, it is extortion.