My point is that as long as I have to choose non-mainstream OSs for secure communication, the tradeoff will not be worth it for me. As will be the case for 99% of "normal" users (most of whom don't even know that they can install alternative OSs, let alone on a USB stick). Things like QubesOs (which I had to Google) are interesting, but I think the general failure of Linux to become a mainstream desktop OS alternative proves that the chances of something like that gaining any relevant degree of popularity are minimal.

So yes I accept the risk that this will come back to me one day, because there's no other practical choice. Just as I decide to go out of the house and take part in normal life, even though there's a high chance of getting into a traffic accident one day.