Just the appearance of having a valid point about the evils of Islamism, is enough to get him noticed, and the "blokey bloke" persona fits in well with most of us who are fed up with smooth talking politicians.
Ok, he has a point, but so did Sayyid Qtub the Egyptian scholar who is regarded as the founder of Islamism. Its easy to have a valid point when exposing obvious evil. A glimmer of truth is not enough though. It is the glimpse that acts as bait to introduce our perception to all kinds of ideologies, religious and political.
Why do we not really drill down into the essence of these things? It is almost as if we suppose that the veil of illusion is superficial and ready to be parted at the merest exploratory gesture. This is not so. Lack of diligence to search out the truth, will only ever result in being wrapped in increasingly elaborate layers of deception. Look, the whole thing is complicated ok, the socio/econo/political framework is extremely detailed but that's not really what is important, what counts is the spiritual dimension, and its not impossible to fathom out, but we have to get on the right footing, disregarding the various strands of christian apostasy without disregarding the truth about God.