It seems to me that Dalrymple makes several powerful arguments here in favor of banning the niqab, especially that it demonstrates deep hostility toward integration into Western values while also revealing a simultaneous desire not to suffer any negative consequences for having done so:
This, in fact, is a typical dishonesty of our time: for example, people simultaneously demand the freedom to pierce their faces with any amount of ironmongery and that employers should take no notice of it. How long before wearers of the niqab similarly demand that employers must not discriminate against them, that they, the employers, must take a quota of women dressed in the niqab? In other words, such women want it all and believe that they can have it. In this way they mix medievalism with modernity.