As a process of broadening the security category, securitisation is used to draw attention to urgent and existential threats that cannot be resolved through ordinary political decisions. It presupposes the authorisation of extraordinary measures as long as they are accepted by the “audience” (the elite or society as a whole). Due to the growing importance of these processes, more and more objections and doubts have been formulated towards the theory of securitisation regarding, inter alia, the morality of these processes, including the intentions of securitising actors (just or unjust securitisation). This article presents case studies on the Poland’s migration policy, in which securitisation movements reinforced social mobilisation by referring to the category of security. The methodological framework of the securitisation theory and the just securitisation theory have been implemented. The presented results indicate that in the process of extending the security category, it is important to study the intentions of securitising actors and the existential dimension of the reported threats due to the power of influence and the effects of securitisation measures.