Jo, I agree with your comments regarding Dachau. Please don't misinterpret my comments about Dachau.
Many died at Dachau due to exactly what you stated. That was evil in itself.
If you read enough history, you will find that Dachau was not designed by the NAZIs to mass extermination like Auschwitz and others. Prisoners from Dachau were transferred to Auschwitz for extermination. As I recall the small gas chamber at Dachau was never used because it was not functional.
Wikipedia has an explanation about concentration vs. extermination camps:
Death camps differed from concentration camps located in Germany proper, such as Bergen-Belsen, Oranienburg, Ravensbrück, and Sachsenhausen, which were prison camps set up prior to World War II for people defined as 'undesirable'. From March 1936, all Nazi concentration camps were managed by the SS-Totenkopfverbände (the Skull Units, SS-TV), who operated extermination camps from 1941 as well.[29] An SS anatomist, Dr. Johann Kremer, after witnessing the gassing of victims at Birkenau, wrote in his diary on 2 September 1942: "Dante's Inferno seems to me almost a comedy compared to this. They don't call Auschwitz the camp of annihilation for nothing!"[30] The distinction was evident during the Nuremberg trials, when Dieter Wisliceny (a deputy to Adolf Eichmann) was asked to name the extermination camps, and he identified Auschwitz and Majdanek as such. Then, when asked, "How do you classify the camps Mauthausen, Dachau, and Buchenwald?", he replied, "They were normal concentration camps, from the point of view of the department of Eichmann."[31]
Mass deportations: the pan-European routes to the extermination camps
Irrespective of round-ups for extermination camps, the Nazis abducted millions of foreigners for slave labour in other types of camps,[32] which provided perfect cover for the extermination programme.[33] Prisoners represented about a quarter of the total workforce of the Reich, with mortality rates exceeding 75 percent due to starvation, disease, exhaustion, executions, and physical brutality.[32]