It's just human nature to want more. Irrespective of whether they are actually worth it.
It is also human nature not to think ahead. If minimum wages in USA go to $ 15 an hour ALL prices go up proportionally.
That means the people who are in low level jobs will have to pay more at the stores where they shop or fast food places. There will be no significant net gain.
Even the welfare limits will have to be raised and create a new poverty $ level.
The upper crust is never effected by minimum wage increases. They adjust the profit and operating margins accordingly.
And yes, when I go through certain neighborhoods where I live and see the attitude towards working, not even looking for work, I shudder to think that these people deserve at minimum$ 15 an hour.