I've mentioned before that Cameron is a bit thick. However, what he lacks in intelligence, he gains in low cunning and artifice. After having comprehensively misunderstood the situation in Syria to the extent of losing a parliamentary vote, he compounded his stupidity by failing to correct the path on which he's embarked - a policy line that has fostered Islamism and inspired Jihadists in the UK and has caused queues of Syrian migrants to pile up at Calais. Yes, they're Dave's fault - though you'd hardly know it.
At the same time he's done absolutely nothing about Islamist snakes such as CAGE's Asim Qureshi, spreading the poison of Islamist hate with carefully crafted phrases that stay just inside hate-speech laws. It is not wrong in the eyes of Islam to lie to and deceive we Kaffirs for Islam's sake; there is no guilt associated with the poison that drips from Qureshi's bulbous lips if it furthers the Moslem Ummah.
Peter Hitchens is on the case in the MOS, but if you want to read the whole unexpurgated condemnation of Cameron's foreign policy stupidity by none other than Peter Ford, former ambassador of the Court of St James to the Republic of Syria, it's in the Guardian here.