Good point about the Weimar Republic as an example of failure mode of democracy. I'm not sure whether it's germaine that part of the failure was it ceasing to be a democracy. Any other examples?

Here you go:

To promote an informed population and democracy in Rwanda, international agencies had promoted development of the media during the years leading up to the genocide.[27] It appeared that promoting one aspect of democracy (in this case the media) may, in fact, negatively influence other aspects of democracy or human rights. After this experience it has been argued that international development agencies must be highly sensitive to the specific context of their programmes and the need for promotion of democracy in a holistic manner.[27]

My comment on it.