Is there really anyone we can trust this day when it comes to money?
Sorry mate, I can't entrust my Bitcoin to anyone, unless my children, and now that I don't have any child yet, I will keep using my Bitcoin as my financial freedom until I have a child of my own, I hope my child grows up into a good human being, or else my bitcoin will be lost forever in my wallet.
If you don't have anyone to trust at the moment, prepare yourself that you will need to enjoy your life with your Bitcoin investment. You invest to live and to enjoy your life so if you have noone to inherit your bitcoins, you will need to have plan to use your money by taking profit.
To leave your bitcoin to someone, you have two ways. A first one is leaving your Bitcoin private keys, wallet mnemonic seeds to that person. Another way is to use time lock and two methods have pros and cons.
I agree with you that it's hard to trust any person but if you have a person you love, at least you can trust him, her if you afford to lose your bitcoin. It's not bad if you let him/ her know about 20% of your bitcoin in a wallet you create for that purpose only.