Many people do not understand or do not want to understand the advantages of using Bitcoin because they have most likely encountered Ponzi schemes in their lives. Their negative experience tells them that they should avoid experimenting with investing in such projects. To explain to such people that Bitcoin is a financial system without any censorship, it is enough to explain in simple terms how this technology works. In order to use the Bitcoin network, they do not need to invest large sums of money. Only by understanding this can Bitcoin be accepted, no matter how negative such people's experiences may have been in the past.
They have tried to explain as simply as possible but they still do not understand and the fact is that they are also tech savvy and only believe in local money and not in digital currencies like Bitcoin.
It's useless to explain it, because their mindset will also not be able to be changed, always related to gambling, MLM and the like.
They don't even touch crypto and even if they have to force to understand crypto it will be very complicated, so leave it alone and they will shut up on their own.
Yes, there are many cases that make them think that bitcoin will die or what, besides because as you said basically the main factor is because of their ignorance of the bitcoin system as a whole. There are many cases of hackers that occur, many frauds that use the name of crypto even though they actually cannot distinguish between bitcoin and altcoin. So when altcoin commits fraud they also think it is the same as bitcoin.
In addition, they do not realize that bitcoin cannot be hacked, what can be hacked are exchangers and wallets if they are not properly maintained. Cases like this make them not believe that bitcoin will last long and assume that bitcoin will die. In fact, bitcoin even though it is hit by many negative issues, some even predict that bitcoin will die, but bitcoin has been able to survive for more than a decade until now, proving that what is reported negatively about bitcoin is not true at all.