We have decided that there should be a minimum standard of living for people that live in the US. Paying for that decision falls on all of us, not just the companies that happen to employ those with lower paying jobs.
This is essentially a special tax on companies that happen to have business models that require low skill labor. Why should companies(1) with business models that only require high skill labor get off the hook when it comes to paying their fare share of the bill for our countries social services?
1. or more correctly those companies stockholders and employees