Why do not they think about preventing the problem that can naturally arise, and wait for when they “plunge” or hopelessly irreversible?

Why don’t people think about the consequences of their civic passivity? “Hut with the edge” is convenient? Why then does not help? When the Nazis grabbed the Communists, I was silent: I was not a communist.
When they planted the Social Democrats, I was silent: I was not a social democrat.
When they grabbed the members of the trade union, I was silent: I was not a member of the trade union.
When they came for me, there was no one to stand up for me.
/The main version of the quote/