I can't read the content of the link you posted, but from your explanation there is no certainty that this individual was killed because they have a lot of BTC, people get kidnapped and killed everyday for different reasons.
But the message of your topic is correct, keep your privacy, don't tell people you have BTC and try as much as possible to use decentralized services, so you don't have to submit kyc everywhere. You can be a victim of a $5 wrench attack if you reveal too much of your identity to the public.
We have to allow the police and other law enforcement agencies to finish their investigation and come out with a report because his death might be caused by other reason. But there is a need for bicoiners to maintain privacy. Social media could be friendly but there are many unfriendly people there. Most criminals are just seeking a trace of your house or office location and just an uploaded picture can give them what they want.
Look at it this way, how can a founder of a crypto project such as this be anonymous or make people believe he doesn’t have bitcoins locked away someplace. Take CZ of Binance for example, we don’t have to link him to a wallet to know he has a good amount of bitcoin. For these persons who are in the public eye, it’s impossible to dissociate themselves from public scrutiny. However for the regular joe, it’s very much possible to maintain privacy and keep your bitcoins unlinked to your identity.
I have a friend that owns an online business and who keeps on showing off his new cars, houses, and other valuables on social media. I was worried so I spoke to him about keeping his personal life private but he told me that it is a strategy to grow his business. People are always attracted by what they see. If you are telling them that they can make money from your company, they want to see you look rich before they will believe. he told that if you don't look wealthy people will not be attracted to your business, especially on the internet. However, he always employs the services of police force to protect him when he is moving to some unsafe area. If Dr. John is a founder of a crypto company, it will be very difficult to believe that he is not a crypto millionaire.