Anyone familiar with Mao's "1000 Flowers"? This was a program to unit the country, allow formerly subversive ideas, open up discussion, etc. So all the dissidents came out into the open to embrace the fresh new air and add their voices to the political scene. Then they were all arrested, having effectively revealed themselves. I have wondered if the "permit" system, and the gun buying impulse generated by the fear of future restrictions was, in effect, the same sort of program, IE, a method of flushing out the potential troublemakers.