I wrote this essay mainly to organise thoughts in my head, and to share them with others. The aim is to provoke thought and debate, and I am glad I have done that. I don’t claim to be right, but do claim the right to put forward ideas for others to discuss. So I thought it would be appropriate to respond to some of the many interesting comments people have made. I don’t expect or need everyone to agree with me. In fact, if everyone agreed with me I think I’d have achieved nothing beyond being another voice in the echo chamber.