But would they have achieved this without the pernicious ideology that motivates them?
We use music to immerse ourselves in a world as far away from David Cameron and his pernicious ideology as possible.
At various times this exceptional view of self has been used as a pernicious ideology, justifying slaughter and discrimination.
The most pernicious ideology is the mantra, repeated endlessly in boardrooms and business schools, that to achieve superior economic performance companies should "maximise shareholder value".
"In the long run, the pernicious ideology underpinning the Paris attacks can only be defeated by upholding the foundational values of the French Republic," he said in a statement.
Most of all, it means more help to train local security forces, to modernise administrations and to stabilise often frail economies.The most dismaying aspect of al-Qaeda's revival is the extent to which its pernicious ideology, now aided by the failures of the Arab spring, continues to spread through madrassas and mosques and jihadist websites and television channels.
Lady Manningham-Buller said in an earlier debate: "I am afraid it is a profound irony that we are seeking to protect our values against this pernicious ideology by trying to bar views that are described, too vaguely, as 'non-violent extremism', but which fall short of incitement to violence or to racial or ethnic hatred, which is already forbidden by law".
That spiritual and physical oneness we all share with this common homeland explains the depth of the pain we all carried in our hearts as we saw our country tear itself apart in a terrible conflict, and as we saw it spurned, outlawed and isolated by the peoples of the world, precisely because it has become the universal base of the pernicious ideology and practice of racism and racial oppression.
The former head of MI5, Eliza Manningham-Buller has similar anxieties: "I am afraid that it is a profound irony that we are seeking to protect our values against this pernicious ideology by trying to bar views that are described, too vaguely, as 'non-violent' extremist - but which fall short of incitement to violence or to racial or ethnic hatred - which is already forbidden by law".
It's by no means as pernicious an ideology as Ingsoc and its attendant newspeak, but it's an ideology all the same.
