It is often forgotten that in their early years in government the NAZI party did a lot of good things for Germany and had a lot of admirers throughout the world. It was only later that there true colours became obvious.
How much later did it take? Dachau was opened in March 1933, two months after Hitler came to power as Chancellor. Now then: Dachau, I fully concede, was a concentration camp in the most literal sense of the term - a single place designed to concentrate together large numbers of people. It wasn't a death camp, a specifically and explicitly designed death factory in the way that Auschwitz was post-1942, a site intended simply to get Jews in by train at one end and send them out up the chimney at the other.
Nevertheless. The inhumanity and brutality of Dachau are on record and well known to those who take an interest in these sordid and ugly matters. It's often (and only partially accurately) said that the Fascist government of Mussolini's Italy drained the Pontine Marshes and got the trains to run on time, but no fascist government on earth can conceive of, design and build a place of the size and nature of Dachau in two months. What I'm saying is, the idea that your political opponents and social undesirables can be summarily arrested, held without due process and incarcerated without trial, subject to starvation and torture, didn't whip up out of nowhere in the two months between Hitler's accession to power and the opening of Dachau. The signs were all there and had been, for a good long while.