Kraepelin and Rüdin were both ardent advocates of a theory that the German race was becoming overly 'domesticated' and thus degenerating into higher rates of mental illness and other conditions. Fears of degeneration were somewhat common internationally at the time, but the extent to which Rüdin took them may have been unique, and from the very beginning of his career he made continuous efforts to have his research translate into political action. He also repeatedly drew attention to the financial burden of the sick and disabled.