Schaaf and Bindseil fortunately are not "the ECB", although they are ECB officials. They seem to adopt a minority position in ECB. However, one should not simply ignore Bitcoin critics, and the best strategy is simply to "prove them wrong".
People who work for the ECB should have adequate education and be intelligent, and this report seems to have been written by two clowns on some drugs. Good luck to anyone who tries to explain to such people that they are wrong, because if they had a little common sense they wouldn't write such nonsense.
Not that I disagree with the fact that they should not be ignored, but there is a saying that a fish stinks from the head, not the tail - and we know that the head of the ECB is a person who has a completely negative opinion about Bitcoin and cryptocurrencies in general.
Sooner or later, they will realize that they lack the knowledge to implement such protocol. It is only a matter of time before they will gain good grasp of this technology. But they actually need to educate themselves so they are not seen as ignorants in this market.
We don't need to "prove them wrong" because the facts are already available over the net. It is just that, people should be open-mind in understanding advancements in the digital market.