some say it's safe, some say it's not. depending on the understanding, principles, and interests of each individual. for those who do not like volatility, and consider it very risky, it is certain to stay away from bitcoin, no matter how big the opportunities offered, he will prefer projects in the real world with official regulations from the government. while for those who have a freer spirit, will consider volatility as a good opportunity to make a profit.
safe or not depends on how we manage and determine the best strategy. so we have to put in a lot of effort and keep learning to adapt to the crypto ecosystem full of surprises.
Maybe you are right but the truth is that we can't consider the investment is a safe haven if we know how risky it was. if we just know that Bitcoin will reach $100k 1 or 2 years from now, that is absolutely we can consider it but we won't and that makes it so hard to think that we are totally safe plus the hackers around us.
That is my many had to say that "invest only the money that we can afford to lose" because we can't hide the truth on this from of investment and certainly we can't guarantee any assurance of our ROI.