This is an excellent book on a very important subject. Most people are unaware of the all-pervasive nature of sentimentality in the modern world -- because it is so all-pervasive. It is also insidious and dangerous and allied to many kinds of evil, as Dalrymple demonstrates.
It is difficult to define sentimentality. One could say it is insistence that one's feelings must be beautiful, and that this matters above all else. So, compassion for a large number of people one knows nothing about -- 'the poor' , say-- is very beautiful, and gives one a warm glow of self-satisfaction. The fact that these feelings have no use for 'the poor', and are indeed only of use for making me feel good about myself, is irrelevant to the sentimentalist. It is not the truth of his thoughts that matter, but the beauty of his feelings. Sentimentalists tend to be utterly ruthless and unscrupulous. They are as dishonest and manipulative with others as they are with their own all-important feelings.
That is only a starting point, of course. There is so much to say on the subject.
One very interesting question, which I wish Dalrymple had said more about, is the historical context. Is there much more sentimentality than there was, say, in Shakespeare's time (an author entirely untinged with sentimentality) and if so why? One reason is the decline in Christianity. Dalrymple is not a believer but the doctrine of Original Sin certainly kept one is a state of healthy distrust of one's feelings, although of course that could turn into unhealthy self-flagellation. Second, the rise of the mass media, and films and pop videos which convey ultra-simple emotional instant gratificaton. Third, the rise of overall wealth and comfort certainly has something to do with it.
Certainly, in my travels to third world countries, I did not spot huge levels of sentimentality amongst poor and religious people.
Dalrymple's savage treatment of modern Britain will make many people -- myself included -- ashamed to belong to such a degraded country. Let us only hope the tendency towards emotional honesty and integrity that he represents regains some ground.