i dont know what protests you've been attending but the one's ive helped at for laundry and warehouse workers were filled with people that were not only supporting families on minimum wage but also contained people who were here on visas.

in america you're always taking a risk by protesting an employer.

The ideal approach is two pronged, you raise the standard which benefits society as a whole and increase the social safety net to take care of those few lost in transition.

The same principle applies to a wide variety of economic changes from increased labor regulations, to housing, to free trade, to automation. Your complaint here is mainly that we haven't followed through on protecting those caught in transition. We shouldn't fall into the trap of mistaking that for a valid criticism against raising the societal standard.