Wow. You have guts. Unproductive is a very mean word to use for people who work their ass off and still get underpaid. Something can be exploitation while it's still legal. And the blame does lie with the employer in that case. If they can't pay their workers a reasonable living wage, they should raise their prices or they have no business, or at least the law should make it so that they don't have one.
Productivity has absolutely nothing to do with how hard you work. Productivity refers to the value you produce. Also, in cases where a person is free to leave the job there is no such thing as underpaid. If the person is underpaid he should leave the job and join somewhere else, if he cant get a better pay it means he is getting paid what he is worth unfortunately for him that is far too less than what it takes to live a good life.
Employers which are corporations in which you and me could be investors have no right to waste our money one some else. Their only responsibility is to deliver returns on our investments by hiring the cheapest possible labor while generating maximum possible value.
If there are poor people around us who need help, it is the responsibility of the society and not of corporations. I would help a poor kid get education by spending my money on him but I will not let a company I am invested in to waste my money on such kind of nonsense.