How much world events have a lasting effect on the stock market is debatable. I agree that the stock market can be impacted by world or home shaking events be they policical, enocomic, etc. that makes traders pucker up for a day, week and maybe even a couple of months. As the shock value of the event wanes, the negative stock impact starts to wear off on traders and investors. We have seen so many "shock" events over the last 50 years like 9-11, Iraq 1, 2, 3, Afghanistan, Iran 1,2 , Somali, China, Russia, Ukraine, etc, etc, etc, that traders and average investors are developing a thick skin. If its not in their back yard, so what? Negative investor psychology is historically short term. Think about how these events affected you when you first heard about them and what your feelings about them are today.
Traders do their do diligence responsibilities by evaluating companies to see annual revenues, earnings, dividends, P-E ratio, yada, yada, yada are growing, and if future growth of stock price increases can be supported. Inflation also has an impact on stock pricing as the dollar depreciates, the stock price has to go up to support the true value of the company. Other people in the woodpile are the players, ones who speculate on companies to drive up the stock price or "influencers" who are giving out stock advice but are just guessing.
Once you get past event and human influ ence, the biggest stock driver in the room is the 800 lb. gorilla known as 401K.
As long as the tens of billions of 401K contributions keep entering their companies accounts daily, immense pressure is on traders like Fidelity, to invest those dollars by holding and buying more stocks to make more money for their investors. They know if they don't make money on a quarterly or annual basis, that huge amounts of money will be pulled out of their company and sent over to their competitors.
Can another 1929 happen again. I doubt it. Can we have dips. Absolutely but there will be a recovery over time. There are just too many drivers in place where the average Joe Schom investor has little impact or even options for his retirement savings and now is just going along with the ride and hopes for the best. Unless we have some catistrophic event that would wipe out our econony like losing a war, aliens invading, Kamala Harris being elected President, I can't see a stock markot just chugging along in the future.