Labour organization ought to be considered as a natural part of the market, and is a valid negotiation tactic. Besides most often it's just a question of getting closer to the true value of ones labour by reducing the amount of profit ones employer can skim off the top. There can be no no profit without underpaying workers in relation to the value of what is sold as a result of their production. I hate fatties to but that's no argument against the unions fighting for the good of their membership.