You're stating the obvious here, and there's no point even discussing this.
Anything you own, whether it's gold, crypto, cash, or comic books, can get stolen if you don't have proper security measures in place. That's been known as long as there's been thievery in this world.
Absolutely, there is no point of discussing this topic. Probably she/he should read more and more before dealing to this forum otherwise she/he talks nothing here. Everything or every investment is not secure from steal, but each has a standard security measurement including Crypto currency.In crypto, as long as the users keep the security private key, it will be safe and secure.