I wouldn't exactly consider the Linberghs "unbiased" regarding Hitler.
There were others, so ad hominem argument re Lindbergs does not apply there: to prepare WWII Hitler simply HAD TO lift Germany from Depression era prostration. Major building programs [autobahns are probably the best known result] did a lot to dissipate the army of 6 million unemployed - and to cement his hold on the population, BTW.