Did The People Who Decided To Incarnate In Bodies Of Black Slaves Or Jews That Were Killed In The Holocaust, Did So Knowingly And On Purpose?

Did The People Who Decided To Incarnate In Bodies Of Black Slaves Or Jews That Were Killed In The Holocaust, Did So Knowingly And On Purpose? Did souls who incarnated as black slaves or Jews killed in the Holocaust choose those lives intentionally and with full awareness, as part of their karmic journey?