"educated" is pretty vague. For instance, some people think that a 75% tax rate on high income is reasonable. The "market" doesn't have the right answer on what the right tax rate should be, and how everyone should contribute to the common good. This (and many parameters that already restrict the mythical free market) should be decided by the society.
Besides, someone can earn money only if they live in a country that gave them the opportunity to do so. If the hypothetical doctor was born in the jungle somewhere, it's unlikely that he or she would have been able to make any money. In that sense, it's hard to argue that a high-tax rate is confiscatory, and I don't find it outrageous if they can only afford 5 cars instead of 10, if that can give more people access to health care.
That isn't the argument though. The original comment was saying that buying a tenth car is somehow inherently immoral, which it isn't.
If I've earned the money I have honestly, it isn't anyone else's business what I do with it. Buy an 100th car or light it on fire. Anyone who wants to tell me what to do with my money (that I've earned and paid all the taxes on) can take a long walk off a short pier.
It is when you buy your 10th million car and the environment is devastated. Whether that or a million people with ten extra cars each the outcome is negative for all. So society does have some say in wealth inequality and spending of those with a much larger impact on everyone.
"educated" is pretty vague. For instance, some people think that a 75% tax rate on high income is reasonable. The "market" doesn't have the right answer on what the right tax rate should be, and how everyone should contribute to the common good. This (and many parameters that already restrict the mythical free market) should be decided by the society.
Besides, someone can earn money only if they live in a country that gave them the opportunity to do so. If the hypothetical doctor was born in the jungle somewhere, it's unlikely that he or she would have been able to make any money. In that sense, it's hard to argue that a high-tax rate is confiscatory, and I don't find it outrageous if they can only afford 5 cars instead of 10, if that can give more people access to health care.