The idea of forcing US Citizens to purchase health insurance that they may not need or want and possibly cannot afford is government interference into personal lives. As we are in a time of economic hardship, there are many families that simply cannot afford the additional expense, and fining them is only going to make their already difficult situation harder.
The affordable car act is not always affordable. People all have various incomes and different bills that need to be met, so in today's society the most affordable thing is anything that is free. People are struggling and having a hard time so anything that costs a good amount of money isn't affordable.