Is Public Engagement A Duty for Scientists?

Do scientists have a responsibility to make their work accessible to the public?"Public Engagement", broadly speaking, means scientists communicating about science to non-scientists. Blogs are a form of public engagement, as are (non-academic) books. Holding public talks or giving interviews would also count as such.Recently, it has become fashionable to say that it is important for scientists to engage the public, and that this engagement should be encouraged. I agree completely