They came first for the Communists,
and I didn't speak up because I wasn't a Communist.Then they came for the trade unionists,
and I didn't speak up because I wasn't a trade unionist.Then they came for the Jews,
and I didn't speak up because I wasn't a Jew.Then they came for me
and by that time no one was left to speak up.--Martin Niemöller--
"Those who cannot remember the past are condemned to repeat it" - George Santayana
Today one might say "Those who want to hold the past in memory as if it were theirs and theirs alone are condemned to be complicit in its recurrence."