If you die then your BTC will be secure in your wallet. But if you tell your private keys and password to anyone then he will access you wallet otherwise your BTC will Secured in your wallet for life time.
You're right and this has happened to a lot of people, in fact, who lost their BTC when they left, because they didn't pass on their private keys to anyone, and no one knew they would be able to use it, and that would have a positive effect on the market. , Because the economy becomes more and more inflationary, and since the BTC limit is limited, it will never have any inflation. These issues are hurting our economy a lot.
Valid question, 
it's a normal human behavior not to trust that much if it's about our investment.
it's a normal human behavior not to trust that much if it's about our investment. Of course, this is a simple human behavior note that makes us believe in investing. It strengthens our confidence and morale. Keeping an eye on this belief gives us the courage to invest.