Final answer:
The flourishing of non-government owned media in a democratic society is possible due to the principle of freedom of expression, which allows for the free dissemination of information and opinions.
Step-by-step explanation:
Non-government owned newspapers, radio stations, and television stations can flourish in a democratic society primarily because of freedom of expression. This is one of the fundamental principles of a democratic society, which ensures that individual speech, the press, and assembly are protected. Freedom of expression enables citizens to be informed, express their opinions freely, and participate in the political process. In turn, this helps to ensure that governments reflect the will of the people and uphold other democratic ideals such as free and fair elections, the rule of law, and the protection of human rights and civil liberties.