No, this was purely due to they typhus epidemic, which in the first weeks after liberation was taking hundreds of lives a day. About 13,000 former prisoners died after liberation, of about sixty thousand prisoners liberated. In fact most of those who would die in Belsen, died in 1945. The conditions in Bergen-Belsen had been growing worse since late 1944, and grew worse and worse in the first months of 1945, with the death toll rising significantly as food and water rations were curtailed, and sanitation became more strained as prisoners were transported often on death marches from camps further East. The prisoner population grew significantly, with survivors of Auschwitz and other camps in the East. At the same time rations were curtailed, and clean water was made unavailable. Prisoners went days or weeks without food, and often over a day without water (people can only survive three days without water). These same conditions allowed diseases already present in the camp to take stronger hold, most notably dysentery, tuberculosis, typhoid fever, and typhus which was at epidemic proportions by liberation. Typhus is generally contracted via lice, which were a huge problem in the camps. And especially when coupled with extreme malnutrition and dysentery, typhus is often fatal.

The portions of the camp which were destroyed were the parts that housed prisoners, and therefore housed typhus. Because typhus lives in lice it is very hard to prevent the spread, especially in the conditions of Belsen, without doing something like destroying the buildings where typhus patients were housed. The survivors and even the British soldiers could be disinfected with DDT, but there was no reason to waste the new pesticide on buildings no one wanted to remember. People were only just starting to think about a need to preserve these sites for things like trials, and certainly weren't thinking about museums or memorialization unless they were perhaps a museum professional. No one wanted this symbol of evil to remain standing, especially when it was also seen as a threat of epidemic. Buildings near the camp, which was used to house the SS and a military school was not infested with typhus causing lice, and so was not destroyed, instead it was converted into a displaced persons camp (what we would now call a refugee camp) where the survivors were housed, in some cases for five years or more.