Volatility could be bad in a way that you can loss your money in a short time and you cant just predict it. Unlike other investment security that there is just a small movement every now and then so can still save some of your investment buy selling it in higher price before it get dip.
Because people tend to experience the pain of loss more acutely than the joy of gain, a volatile stock that moves up as often as it does down may still seem like an unnecessarily risky proposition. However, what seasoned traders know that the average person may not is that market volatility actually provides numerous money-making opportunities for the patient investor. Investing is inherently about risk, but risk works both ways. Each trade carries with it the risk both of failure and of success. Without volatility, there is lower risk of either.
Volatility can benefit investors of any stripe. Many more conservative traders favor a long-term strategy called buy-and-hold, wherein stock is purchased and then held for an extended period, often many years, to reap the rewards of the company's incremental growth. So for that I think its not a bad thing after all.
Yes, that's right, investment needs to has risk.
More risk, the investor can earn more profit from that investment, but the percent to lose money also not small in that investment.
Bitcoin and cryptocurrency investment really good example for this theory, because the total money lost and earned from this market is large than many bubbles in the past, as far as I know.