That's funny... the InfoSec community has no clue about what it takes to actually secure a computer. It was figured out in the 1970s[1], after issues with mixed levels of secret information couldn't be handled quickly in the Viet Nam conflict, and is now mostly forgotten.
You can take $5 from your wallet and hand it to a stranger, without needing to trust them with everything in your wallet.
You can not take a single file in a folder and hand it to an executable, without needing to trust it with everything on your computer.
You can take $5 from your wallet and hand it to a stranger, without needing to trust them with everything in your wallet.
You can not take a single file in a folder and hand it to an executable, without needing to trust it with everything on your computer.
[1] https://en.wikipedia.org/wiki/Multilevel_security