That's simply because of human nature. Now our only goal is to not fall into the same pits that people in the past have fallen onto.
Though unfortunately for the most of us, experience is the best teacher. That's not necessarily bad though; as long as you jump back up and try again.
I agree on your point but let’s also consider that every human being has its unique characteristics. But we share the same goal at the end of the day. Although losses are still inevitable no matter how we’re good at combatting with it, but if we learn to fight without quitting and regretting, perhaps all of us will still end up being successful. Same like trading, it does not matter how much and how often you lose, as long as you tend to correct your mistakes everytime by not repeating the same mistakes again.