Hiring a bodyguard isn't practical for small investors. Big tech employees & whales won't have to worry about hiring personal security because they've got money to protect themself & their families. Criminals won't be put off if rich ppl hire bodyguards they'll try to find a way to kidnap.
If he is an influencer (or crypto public figure), founder of a crypto project, then the only way is to hire a bodyguard for his security, wherever he goes must always be accompanied to maintain security, likewise their families who are potentially kidnapped must get the same security team.
However, if this kind of thing happens to me, of course I feel that the world is not free because I have to be followed by many people, it is better not to be an influencer and or show off my BTC ownership and it is better if no one knows at all, I think that is much better and live peacefully.
Criminals are now modern and organized, they are much more dangerous, especially in countries that are too free or have low levels of law and security.