That is because to avoid such regrets in the future.
It's better for a person to take the risk in investing and do what they can to make it stable in a long run than doing nothing.
At least if it's fail, you try it out to yourselves and sees actually the result.
But take note that investing in BTC will really take a person for a stable long term investment.
If we are just keep on worrying with the risk then we will never take the next ladder of sucess.
Of course every investment has it's own set of different risk so rather to worry about it, play with it.
How come there are succesful person today? All of them also face the risk.