Ideally, this:
But at the absolute latest, some time in 1938. The problem with a date like 1938, however, is that Nazi antisemitism has already been put in place largely, so even that date is rather late morally. The fact that the policies enacted by that time were relatively minor compared to what came later though means that one might be able to, on a very relative scale, contemplate 1938 as the "right time" to knock off that madman.
Shortly after April 1st 1924 when he got off lightly for treason and inciting murder that lead to the death or 18 people
But at the absolute latest, some time in 1938. The problem with a date like 1938, however, is that Nazi antisemitism has already been put in place largely, so even that date is rather late morally. The fact that the policies enacted by that time were relatively minor compared to what came later though means that one might be able to, on a very relative scale, contemplate 1938 as the "right time" to knock off that madman.