The picture above was taken in October 1938, Lindbergh received a silver cross from Herman Göring the then 2nd highest Nazi official.
Below is part of timeline of the Holocaust up to that point.
Adolf Hitler appointed Chancellor of Germany
Dachau concentration camp opens
Boycott of Jewish shops and businesses
Laws for Reestablishment of the Civil Service barred Jews from holding civil service, university, and state positions
Public burning of books written by Jews, political dissidents, and others not approved by the state
Law stripping East European Jewish immigrants of German citizenship
Jews barred from serving in the German armed forces
“Nuremberg Laws”: anti-Jewish racial laws enacted; Jews no longer considered German citizens; Jews could not marry Aryans; nor could they fly the German flag
Germany defines a “Jew”: anyone with three Jewish grandparents; someone with two Jewish grandparents who identifies as a Jew
Jewish doctors barred from practicing medicine in German institutions
Germans march into the Rhineland, previously demilitarized by the Versailles Treaty
Himmler appointed the Chief of German Police
Sachsenhausen concentration camp opens
Hitler and Mussolini form Rome-Berlin Axis
Buchenwald concentration camp opens
Anschluss (incorporation of Austria): all antisemitic decrees immediately applied in Austria
Mandatory registration of all property held by Jews inside the Reich
Evian Conference held in Evian, France on the problem of Jewish refugees
Adolf Eichmann establishes the Office of Jewish Emigration in Vienna to increase the pace of forced emigration
Italy enacts sweeping antisemitic laws
Munich Conference: Great Britain and France agree to German occupation of the Sudetenland, previously western Czechoslovakia
Following request by Swiss authorities, Germans mark all Jewish passports with a large letter “J” to restrict Jews from immigrating to Switzerland
Lindbergh attended a dinner in Berlin with several distinguished guests. That evening Goering presented Lindbergh with the Service Cross of the German Eagle for his services to world aviation.
None of the previous events were secret, they were all widely reported. Yet Charles Lindbergh was happy enough to accept an award from a regime who at that point already murdered several thousand Jews, Political prisoners and people with disabilities.