This is another one of those books that I think would benefit from a new edition, but because it's stood the test of time rather than it no longer being fit for purpose. Though the normalisation of censorial attitudes is a problem that Grayling addresses, in contrast to the modern hand-wringing about cancel culture, Grayling correctly identifies the biggest threat as coming from state overreach, and, importantly, the way justifications of such overreach have become accepted. The results of fear of crime and terrorism that took hold during the Bush administration have reached an ugly conclusion with the modern Trump administration illegally detaining people on the pretence of national security and decrying those who respect legal and liberal precedent as traitors. Grayling draws comparisons between the temporary wartime restrictions to the ones that became indefinite fixtures during the ambiguously defined 'War on Terror', setting the stage for people to become convinced that everything they hold dear is constantly under siege from without, something the unscrupulous use to destroy their rights from within. These are the anti-Enlightenment forces that are most pertinent for us today, Islamist fundamentalism being more of a side show (at least in Western countries) and Grayling identifies this very well.
The second part of the book was stronger than the first. The first is very much Grayling's usual furore, and not bad per se, but it does mean that the important ideas he discusses are left without all of the dissection necessary. Perhaps the philosopher's role should be to give us better questions than firm answers, but given Grayling wasn't shy to opine very firmly on certain matters, it seems to me he should have gone further. In his later book 'Democracy and Its Crisis' he gives certain practical solutions to making representative democracy work better, so I think this book could have definitely done with his views on how best to combat terrorism without resorting to suspending due process, engaging in endless wars abroad, and turning the country into a surveillance state.
However, as said, the second part, dealing with specific commentators and their opinions, was definitely the strongest, where Grayling puts his sharp analytical skills to the best use. His skewering of John Gray's myopic and Orientalist pessimism was welcomed, and his careful analysis of the essentialising risks of Roger Scruton's traditionalism has, in my view, heavily stood the test of time, and my guess is that in the modern day he'd be likely to go after the likes of Jordan Peterson and Douglas Murray. Also pertinent was his criticism of Slavoj Zizek's approach to activism, and attempt to divide liberals and leftists when the opposite is needed (and I do believe in recent years Zizek has got a bit better about that).
Anyway, especially now, I think this is a useful read, and for anyone wanting to read a serious, sober piece about Enlightenment values in the age of holy terror WITHOUT going down the neoconservative route, I highly recommend this.