Criticism of Slavic genocide denial

Mar 2017
When the Holocaust deniers point out that there are few material proofs of Holocaust [the Germans destroyed them] the best response is demography. Since 5-6 millions of Jews disappeared they had to be killed.

The same goes for the Slavs: 13 millions disappeared so there had to be a genocide. Another hard proof: it's easy to count the cities and villages destroyed. During the war years, 1710 cities and urban-type settlements and more than 70,000 villages were destroyed. Assuming that the majority of their inhabitants were murdered at least 5 - 7 millions died (that excludes dead in famine and German camps).