Honestly we learned from others mistakes. I think I have learn a lot from mistakes of other people than I have personally made mistake myself.
Smart and open-minded people are ready to listen to reminders, learn from them exclusively valuable lessons and expensive mistakes of the other people. They know that if they can learn from the other people's mistakes, they can save a lot of money by minimizing losses from their own mistakes. Unfortunately, such people are only the minority in the community and most people do oppositely, so they learn from their own mistakes and financial losses.
Ever since the Binance hack happened, it's one incident to another. Even this morning, there is an exploit in some chains. Yesterday, Binance also made an announcement about IOS vulnerability that is making seed phrase accessible. Things are getting out of hand with this bugs on chains.
Then, what's happened so far, many people still leave their bitcoin and cryptocurrencies on Binance and other centralized exchanges. They don't feel need of withdrawing funds from CEX to their non custodial wallets during these chaotic time.