"Your problem is one which faces all who contemplate taking part in demonstrations involving civil disobedience. ... I should not feel inclined to blame those who hang back for the sort of reasons that you indicate but I could only give positive praise to those who do not hang back. I think it is also worth remembering that, if protests are sufficiently widespread, it will be impossible to victimize any of those concerned except the leaders." "[T]otal destruction … may occur at any moment and is likely to occur within ten years".