There is no statement so absurd that no philosopher will make it, or so said Cicero in the first century BC. And philosophers as a class have a reputation for wasting years and lives on fruitless speculation.
Which is why AC Grayling is so impressive. On paper he has the qualifications for sterile theorising – he is, after all, a Professor of Philosophy at Birkbeck College, part of the University of London. In practice he writes accessible books which take positions about real world issues.