Labor is an expense like any other.  The value of the labor should not exceed the value of the work they provide.

For instance, an entry level job is not worth $15/hour, regardless of how many dependents you support.  Go ahead and raise it, and then find that the entry level job has disappeared.  The evidence?
ATMs have replaced bank tellers.
Self-service gas has replaced gas station attendants
McDonalds is using iPads to take orders.

The people most effected by a raise of the minimum wage are poor people.  I thought you liked poor people.