You are right on. How much does it actually cost per hour to employ someone at $15 an hour? Just guessing I would say it must be close to$25.
They also don't seem to understand that most businesses employing entry level people are borderline.
Finally, since so many of them work [or have worked] for the gub'mint, they believe that businesses budget for "head count." No. We don't. If I have $240,000 for 10 FTE entry-level workers and the minimum wage goes from $7.25 to $15 /hour, I don't suddenly find room in the budget to keep them on. I suddenly find $240,000 pays half as many people, and half of them are gone.