Why not much is said about the Non jewish Germans in concentration camps who were AGAINST the Nazis?

History has not forgotten the victims of the Nazis who weren't Jewish, but the vast majority, 6 million, were Jews and were exterminated in accordance with a carefully planned and systematic policy of genocide on racial grounds. Other groups, in much smaller numbers, included Gypsies, homosexuals, communists and the mentally disabled. I don't think you are right in thinking that most Jews had left Europe at the time of Kristalnacht. Even the majority of those within Germany itself were trapped.