This is an excuse not a reason.
Maybe so, but it's definitely something to consider.
When emergency treatment is mandated by law, free market efficiencies evaporate. Bottom line: the insured bear the cost of the uninsured. Personally, I would like to pay less for my health insurance or to have fewer out of pocket expenses. Treating the uninsured increases my costs. However, it is both humane and Christian to treat those in need of emergency care, regardless of ability to pay. Nonetheless, we are only cost shifting in this instance.
Something has to be done before costs eat us alive. The proposed plans may not be the answer, but we must seek some kind of reform.