There is even a quote on Hilbert's page: About a year later, Hilbert attended a banquet and was seated next to the new Minister of Education, Bernhard Rust. Ru

There is even a quote on Hilbert's page: About a year later, Hilbert attended a banquet and was seated next to the new Minister of Education, Bernhard Rust. Rust asked whether "the Mathematical Institute really suffered so much because of the departure of the Jews". Hilbert replied, "Suffered? It doesn't exist any longer, does it!" Not sure that fully explains it, but its a sad and tragic loss nevertheless.