Targeting Asians is not common sense, it's racist

This "common sense" approach is objectionable in practice and principle: it is ineffective, as non-Asians can be used for attacks; it is over-broad, including people who, despite appearances, do not belong to racial or religious groups suspected of terrorism, such as Sikhs; the proportion of people involved in terrorism is minute; and it is wrong to stigmatise all by reference to a tiny minority; and targeting causes resentment and disaffection.