The UK’s Counter-Terrorism and Security Act 2015 (CTSA) – which amongst other things, imposes a legal duty upon schools, universities, the NHS and other institutions to ‘have due regard to the need to prevent people from being drawn into terrorism’ – has aroused great controversy in education at all levels. Reviewing the debate in the tertiary sector, this article argues that the campaign against it is based largely upon myth, misinformation, misrepresentation, and misconception. It concludes that, apart from the inclusion of ‘non-violent extremism’ and barring some other fine tuning, the CTSA is legitimate and necessary in higher education in a state committed to democracy, human rights, the rule of law, and cosmopolitan community cohesion.