Jeff Aronson warns that prolonged success breeds dangerous overconfidence. When an investor is on a hot streak and feels they can do no wrong, their perception of risk becomes warped. This psychological shift, where they think "I must be good," is precisely when underlying risk is escalating, not diminishing.

In a rising market, the investors taking the most risk generate the highest returns, making them appear brilliant. However, this same aggression ensures they will be hurt the most when the market turns. This dynamic creates a powerful incentive to increase risk-taking, often just before a downturn.

The most imprudent lending decisions occur during economic booms. Widespread optimism, complacency, and fear of missing out cause investors to lower their standards and overlook risks, sowing the seeds for future failures that are only revealed in a downturn.

Investors often underestimate how easily years of compounded gains can be erased by a single bad decision, such as using excess leverage or making an emotional choice. Downside protection is not merely a defensive strategy; it's a vital, offensive component for ensuring the compounding engine survives to continue running.

The primary driver of market fluctuations is the dramatic shift in attitudes toward risk. In good times, investors become risk-tolerant and chase gains ('Risk is my friend'). In bad times, risk aversion dominates ('Get me out at any price'). This emotional pendulum causes security prices to fluctuate far more than their underlying intrinsic values.

According to Andrew Ross Sorkin, while bad actors and speculation are always present, the single element that transforms a market downturn into a systemic financial crisis is excessive leverage. Without it, the system can absorb shocks; with it, a domino effect is inevitable, making guardrails against leverage paramount.

Widespread credit is the common accelerant in major financial crashes, from 1929's margin loans to 2008's subprime mortgages. This same leverage that fuels rapid growth is also the "match that lights the fire" for catastrophic downturns, with today's AI ecosystem showing similar signs.

Howard Marks argues that you cannot maintain a risk-on posture and then opportunistically switch to a defensive one just before a downturn. Effective risk management requires that defense be an integral, permanent component of every investment decision, ensuring resilience during bad times.

While low rates make borrowing to invest (leverage) seem seductive, it's exceptionally dangerous in an economy driven by debt management. Abrupt policy shifts can cause sudden volatility and dry up liquidity overnight, triggering margin calls and forcing sales at the worst possible times. Wealth is transferred from the over-leveraged to the liquid during these resets.