Agreed but May is the one who brought up the Hitler comparison. I think that encryption is minimally effective in cases of actual totalitarian states like Nazi Germany, the Soviet Union, or North Korea. They have too much control, secret police, informers, etc. that encryption doesn't represent a viable way of effecting change in government. In those types of situations your neighbors can just report you for being a dissident and the Stasi can just carry you away in the middle of the night or bug your entire home.

In countries like the USA, or even Apartheid South Africa it can have a much bigger role in organizing protests and other activities.