Diuretic, think of it like this. You live in a country whose economy is booming because credit is expanding, people are spending, houses are being built, jobs are plentiful, wages are increasing, etc. Even if you weren't trading stocks, or flipping houses, you were still benefitting from that prosperity. If you were borrowing and spending like crazy, for instance, because the money was flowing like wine, you played your part. You can pretend that you had no part in the downturn, but you did. If you jacked up your credit cards, bought a ton of trinkets, and neglected to save for a possible downturn, you share some of the overall blame. If you're living well because of the investor class jolting the economy, and the middle class spending like drunken sailors, then you share responsibility too. When the market is prosperous, you share in the prosperity. When the market hits a downturn, you share in that too.
To answer the later question, the market isn't just the stock market. It's everyone who is collectively making a transaction for a good or service. Money exchanging hands constitutes the market, for instance. Unless you were living in the woods somewhere off the grid, bartering in some kind of closed commune amongst like-minded people, you were benefitting somehow from the entire market's period of success. So why should you not share in the failure as well, considering that as a citizen, you are partly responsible for the market in which you participate on a daily basis?
If you can be free to benefit from the market, you can be free to suffer the potential consequences of the risks you take, as well.
To me, THAT is what is "fair".
It works progressively, too. The investor class lost a LOT of money. Some should have lost entire businesses because of their malinvestment, misallocations, and overall risk-taking. But instead they were REWARDED for their mistakes by literally being given the blood, sweat, and tears of the taxpayer collective. If you ask me, THAT is the TRUE collective punishment. Taxing the whole country, devaluing an entire currency, to pay for someone else's mistakes.
Sure, some played by the rules, and bought a house they could afford, and are currently making good on their liabilities. They should not be TAXED to pay for someone else's risk, but they certainly can share some of the economy's downturn, considering, like I said earlier, they did benefit from the boom as well.
That's the ultimate difference in my opinion.