They lie shamelessly.
As does most other sources cited by Dirk.
According to an in-depth review, only 1/3 of the cases listed could be verified, and even less of them were commited by refugees. Though it is not surprising that Dirk can only think about those things, if I were to spend my time on sites like that, who knows what I would believe.
google.com/amp/spiegel.de/international/germany/is-there-truth-to-refugee-sex-offense-reports-a-1186734-amp.html