Pastor Martin Niemöller once said;
"First they came for the Socialists, and I did not speak out—
Because I was not a Socialist.
Then they came for the Trade Unionists, and I did not speak out—
Because I was not a Trade Unionist.
Then they came for the Jews, and I did not speak out—
Because I was not a Jew.
Then they came for me—and there was no one left to speak for me."
However I think the one most fitting saying in this instance is;
'All that is necessary for the triumph of evil is that good men do nothing.'