O human rights exist? What is the purpose of the rule of law?

1000 words per question.

Do human rights exist:
are there human rights? how can human rights be understood and justified? how are the events in Tiananmen square best described? Were human rights abused?

What is the purpose of the rule of law?:
full harvard referencing
Heywood, A. (2004) Political theory: an introduction. Third edition, Basingstoke, Palgrave, Chapter 7, Rights, Obligations and Citizenship, pp 184-219.

Woodiwiss, A. (2005) Human rights. London, Routledge.

Clapham, A. (2007) Human rights: a very short introduction, Oxford, Oxford University Press
Heywood, A. (2007) Politics. Basingstoke, Macmillan, Chapters 4 (on democracy) & 5 (on the state).
Heywood, A. (2004) Political theory: an introduction. Basingstoke, Palgrave Macmillan, Chapter 8 especially (on democracy)
Levin, Michael (1992) The spectre of democracy: the rise of modern democracy as seen by its critics. London, Macmillan.