Because they want to be able to defend themselves from you and people like you (who own the means of living) from abusing and exploiting them.

Why do you mind if they have a say? If you don't plan on abusing and exploiting them, there's no harm, right?

EDIT: to put it into words I would think someone like you might understand better (power and money instead of empathy and solidarity) - because if you don't let them have a say, and exploit them, you might end up in a gulag, on guillotine or in wherever mass grave Mao put landlords.