The reasons why many people have trouble holding on in a bear market can be attributed to the following:

1. Mentality: Bear markets often trigger panic and anxiety among investors, leading them to make irrational decisions. Young investors may consider buying on dips in a bear market, while older investors may be more concerned about adjusting their living expenses and investment portfolios.

2. Economic pressure: During the bear market, the shadow of economic recession has caused many people to face greater economic pressure, especially those investors who are about to retire or have already retired, who may need to adjust their living expenses and investment strategies.

3. Market volatility: Bear markets are highly volatile, and the market may plummet in an instant, causing huge losses to investors. This uncertainty makes it difficult for many people to withstand long-term market pressure.

4. Lack of long-term investment plan: Many investors are easily affected by market noise during bear markets and change investment strategies instead of sticking to long-term investment plans. History has shown that patient and disciplined investors use time to reduce the risk of losing assets by increasing their holdings.

5. Timing difficulties: A common mistake retail investors make is trying to avoid the bear market by selling their positions, but it is not easy to exit at highs and enter at lows. The market usually turns sharply upward when it is not optimistic, causing many investors to miss opportunities.

6. Excessive pessimism: During a bear market, investors tend to be overly pessimistic, believing that the market has no bottom and even that the stock market will start over. This pessimism will affect their investment decisions and lead to missed investment opportunities.

7. Lack of cash flow: In a bear market, many people do not have enough cash flow to cope with market fluctuations. The reason why Buffett can remain greedy in a bear market is because he has a steady stream of cash flow. If ordinary people can focus more on their careers and work and accumulate cash flow, they can stay rational and seize opportunities in a bear market.

8. Lack of patience and optimism: Bear markets often require investors to be patient and optimistic. Many people lack patience in bear markets and are easily affected by short-term market fluctuations, leading to premature selling or missed investment opportunities.

9. Misunderstanding of market cycles: Many investors have a misunderstanding of market cycles, believing that bear markets will last for a long time, while ignoring the natural fluctuations and cyclical nature of the market. Understanding market cycles and economic laws can help investors better cope with bear markets.

From the above points, we can see that surviving a bear market requires not only investors to have a good mentality and investment strategy, but also to have sufficient patience, cash flow and understanding of market cycles.