When you go into a supermarket, the business is happy to have you as a customer. As long as you pay for your purchases, they don't care if you are an American citizen or an illegal alien. The grocery clerk does not check your documents as to your citizenship. Instead, the bill is tabulated and the payment is processed.
Now imagine, instead of having a competitive market, you had a single food-care building in your community where you do your shopping. Because it's a monopoly, the prices are unaffordably high. Therefore, you need government-subsidized food-care insurance (which will pay for the food).
With this situation, it suddenly becomes an issue as to whether or not the person is a legal citizen. We Americans are forced to pay taxes (and/or comply with an individual mandate) to subsidize for others who'll receive free food-care. But this isn't fair. The taxpaying citizen is forced to pay for the grocery bills of the illegal immigrant who gets a free ride. (This causes resentment and stirs up hatred.)
With ObamaCare, the illegal alien is exempt from punishment if refusing to purchase government-approved healthcare insurance. Yet he/she will still receive free healthcare at the hospital ER department. Why are the illegals exempt from this mandate? (Many use the hospital as the locale to give birth to a baby so that it'll be granted citizenship.)
Now, wouldn't it be better if we had a truly competitive, free market of "pay as you go" hospital care. Imagine, if like your neighborhood grocery store, we had "charter" hospitals accepting people who pay cash for their care. Prices would be low because there would be competition. There wouldn't be the market distortions associated with insurance or Medicare. Consumers are in charge of their own healthcare, not the insurance company or the government. (And it wouldn't matter whether the customers are illegal aliens or not -- everybody pays for their HC out of their own pocket.)
Likewise, we could have "Salvation Army" type of hospitals for the truly indigent. Americans are charitable folk. People like Bill Gates and Warren Buffett could use their $$ millions to fund various charity hospitals. Then you have the very wealthy Mormon Church and also the Catholics. How about Jewish and Islamic foundations, too? This voluntary model of care-giving is so much better, so much based on love and generosity, than the coercive model of "corporate socialism."