Just because you can manipulate a government to the point of making your criminal activity legal, don't make it right. :huh:
You're right. At some point there is ethics and morality to consider, and bankers should have a big dose of both. But there are two ways to get to the point we have gotten to. If you go back 10 years, bankers might have figured out these arcane investments, and thought, "Wow, there are billions to be made here by our investors, and our fees will reap hundreds of millions". If this was their mindset, and they weren't breaking rules, there is nothing unethical about that - even if the world economic situation changed and their plans resulted in giant losses.
On the other hand, if their mindset was, "Wow, we've figured out a way to make hundreds of millions in fees on these investments. Our investors might lose their shirts, but we'll get paid either way." This is unethical whether it's legal or not. Now, which was it? I don't know and you don't know. We can both guess, but in my mind, assuming the techniques were legal, it makes a big difference if the bankers expected big losses for their clients or if they really thought everyone was going to make a lot of money. It's just not as simple as - a lot of people lost a lot of money while bankers got rich, so bankers are evil.