@Azure because some people were indoctrinated to believe people are worth as a living being the number that's written in their paycheck. As there's a wage gap between white and blue collar workers, white collar workers usually behave like an ideological reserve in protection of capitalism, which also blinds them from seeing themselves as workers who depend on an income to continue existing.
However that's hard while "unionizing", "worker class", etc. are taken as bad words.