This chapter examines the ideological dimensions of political correctness (PC), arguing that it serves as a mechanism to protect and further liberalism, particularly the values of individual liberty and equality. While debates on PC often contrast post-modern defenders of speech regulation for social justice with Enlightenment liberals who advocate for open discourse and scientific rationality, this dichotomy is flawed. Both camps use PC to shield liberalism from illiberal truth-claims, albeit through different strategies. Post-modernists overtly regulate speech under the banner of liberating tolerance, while Enlightenment liberals employ subtler methods, such as marginalising or ignoring illiberal perspectives within liberal science. Furthermore, the chapter explores the distinction between liberalism and Enlightenment rationality, revealing that the latter can exist in non-liberal moral frameworks. Ultimately, the socio-academic debate on PC is not about rejecting or endorsing it but about determining the most effective ways to safeguard liberal values, underscoring the circular and self-reinforcing nature of these discussions.