Re: "What word does the man in the street understand?"
"If we shy away from using words because we fear people won't understand them we'll just reduce the number of words that people do understand. Worse than that, we'll reduce the number of ideas that people can hope to understand. Let's keep using the right words for the job and work on helping people to comprehend them."
Exactly. If you can spare the time, re-read 1984. IMO that's the main point Orwell wanted to make. Changing the language can change the ability to think. In 1984 the party works towards the point where no-one is able to say or even think anything dissenting from the party line - because there are no words to do so. As horrible as it is, the mass surveillance is trivial in comparison.