Constructive complaint requires only two things: that what you are complaining about should be different, and that it can be different. It sounds simple, but too often our protests fail this test.

The greatest moral failing is to condemn something as a moral failing: no vice is worse than being judgmental.

I'm not one of these people who is sour about academia. I'm very lucky not to be in academia, but I am an absolute parasite. While I was writing my book on comparative philosophy I was drawing on some fantastic scholars - university based people. The academy is absolutely necessary, but there should also be a role for those bringing it together. It's such a frustration sometimes.

Trade has played a vital role in the social evolution of humankind. It allowed people to specialise, which raises both skill levels and efficiency. It brought people from different lands together, co-operating rather than competing over resources.

I don't think there is ever a direct connection between the philosophical community and the wider populus. I'm very aware of this because I've been working on a book on ideas in global philosophy and you always find some kind of relation between the dominant philosophies in a culture and the folk philosophy but it's not a straight-down dissemination. It's partly bottom-up. Thinkers are the products of the cultures they grew-up in. They aspire to thinking purely objectively and universally, but they are often reflecting ways of thought that are embedded in a culture.

Even if we can agree that some things are natural and some are not, what follows from this? The answer is: nothing. There is no factual reason to suppose that what is natural is good (or at least better) and what is unnatural is bad (or at least worse).

Too often, complaint is not about principled objection on moral grounds, but opportunistic objection on grounds of self-interest. To rectify this, we need to work on mastering the art of complaint.