Unemployment is necessary under capitalism. Employees point to the suffering of unemployed people as an implicit threat to their workers. Look how bad off those people without jobs are, you'd better do what I say if you don't want to be one of them. Don't ask for more money or better treatment, you're not valuable or special, there's a hundred unemployed people out there who would work cheaper than I'm paying you so watch your mouth.
Who'd stay at a job where they're treated like shit, if they weren't afraid of the consequences of defying their employers? Capitalism doesn't work without starving, unemployed workers as an implicit threat to keep the others in line.