They had good intentions

That is how Chief Justice John Roberts justified Obamacare:

“Congress passed the Affordable Care Act to improve health insurance markets, not to destroy them. If at all possible, we must interpret the Act in a way that is consistent with the former, and avoids the latter.”
-Chief Justice John Roberts, author of the SCOTUS decision in King v. Burwell

There are good reasons to believe this decision will neither improve health care markets, nor avoid destroying them. The majority decided this case based on their perception of the intent of Congress, despite compelling evidence to the contrary.

1. The intent of Democrats in Congress – the only people who voted for it – cannot be known in this regard since they did not read the Bill.
2. Jonathan Gruber, the main government architect of the law, says the intent was to fool the American people. And, specifically, by forcing the States to participate or lose the subsidies.
3. Obamacare has utterly failed to improve insurance markets. It has made insurance companies rich, at great cost to the people.
4. An argument advanced by those who passed the Bill is that Obamacare is intended to further the destruction of the “market,” so as to institute a government run single-payer system akin to that of Canada.

Justice Roberts, and his 5 comrades, have severely damaged the rule of law.