Basically, this is the ignorance of the subject matter why most people are afraid of something. If they will start educating themselves, they will learn more and so they will understand the true nature of it. And I guess, they will be the one endorsing it to their family and friends once they get acquainted with bitcoin or crypto. If they will try at least one bitcoin transaction, I bet, they will change their mindset. Sometimes, it is only in their heads why they reacting for something they don't know of.
Well I guess there is no other reason why there are people who are being afraid with bitcoin and it is the lack of knowledge when it comes to this cryptocurrency. So when your relatives or someone you known are being afraid with bitcoin since you already know and already dealing with bitcoin be it trading or investment it is not exactly your responsibility to explain or enlightened them about bitcoin but if ever they ask you about it i bet you should do it.