Theodore Dalrymple returns in the June edition of New Criterion with a classic essay covering too many interesting subjects to list here.

No one will have failed to notice the rapidity with which the morally unthinkable these days becomes the acceptable and then, very soon afterwards, the unassailable. Once the formerly unthinkable becomes the unassailable, outrage is expressed by the guardians of the orthodoxy when the unassailable is in fact assailed by people who are deemed not merely mistaken in their views, but wicked or evil.