Death - if is a significant amount then you can always make a back up with a will and a solicitor will execute your wishes .
Fire - keep a back up some other place than your house
Loss - again you can make backups
That is true when you die nothing is gonna happen to your bitcoins it will stay the same just stock on your wallet and that will never be access my anyone if you did not tell anybody what is you passwords it is like an account in some technology if you die then it means you cannot access it anymore so that is how bitcoins also work. So my advice have a will and testament if you have a lot of bitcoins because that can be on your family if you die. And that is gonna help them instead of being forgotten