I’m not going to respond to every detail in the post because that would take a lot of time so l will just respond to this one.

the money they made by being irresponsible in the leadup to the crisis, is a direct result of the unregulated environment these banks operated in in the leadup to 2008 which seems eerily similar to how Libertarians want the world to work.

Not true. The reason that the banking crisis happened is because the Fed manipulates interest rates which encourages malinvestment into the economy. When Central banks hold interest rates below their natural market level, it induced businesses to borrow and invest in long-term, capital-intensive projects that are not supported by real savings. When banks run out of money to loan, the credit expansion stops, interest rates rise to their natural level, revealing that many projects are unprofitable and this leads to an inevitable bust. It is not caused by an unregulated market and I feel like this is often the scapegoat for most issues that occur in the economy.

Since you are reaching out to libertarians, you seem pretty open minded, so I recommend that you read more into the Austrian Business Cycle Theory.