It's the dark side of the gambler's fallacy. Some people think they are 'due' and if it doesn't happen they think someone is to blame.

In general you can never eliminate the variance completely unless you turn it into a carnival game. Perhaps if you do it again you can raise the house edge and reward the investors who stay in for the long haul and don't run when there is a big downturn. With a bigger HE there is also less variance. But if you can't kick yourself for not having a 2% HE, as the threat never goes away.

Look at Blackjack. I know that if you use basic strategy you can get under 1% house edge with most games, but many people don't use basic strategy. But more importantly people don't play their bankroll through one time, they gamble repeatedly with their winnings.

Nevada statewide made 11.87% of the money put down on it's 2,703 blackjack tables winning $1.084 billion in the last 12 months. But even with that kind of advantage, you still have whales that turn individual casinos upside down once in a while.