Let's talk about air gap.
There is a lot going on regarding security, but I think personally that the best way to protect your data is to have an air gap, that you store in a faraday cage when unused.
The setup would be simple: Get an x220 (easy to move/hide), install all what you need (gentoo, why not some niche os that are the simplest possible, regarding what you want to do with it; libreboot/coreboot etc..), remove the microphone, speakers, bluetooth card, wifi card etc.., block the ports, and store it into a faraday cage.
The setup is very cheap. What would you use it for; you could use it for accountability, to take your notes using org-mode and emacs.
Is this setup safe enough to not get any contact with the exterior? The only way to get to it is if the SWAT breach you home.
There is a lot of attack, like TEMPEST, but I don't see these physical attacks happen because of the cost, especially if you're a low target (remember: if you're french and you ever touched to Tor, or encryption, then you're on one of their "list". Imagine if you try to escape from surveillance or if you go on independant website against the government...).
What do you think about it? What other measure (that would still be cheap to operate) could we add?
PS: Fuck you pedos and such. No security will separate you from the punishment you deserve.