Ritically analyse why treaties on human rights do not grant rights directly to individuals.

N.B. : THIS IS AN INTERNATIONAL LAW ESSAY
This essay should have 4 or 5 paragraphs, besides introduction and conclusion, including: The role of the state (state sovereignty and state responsibility), the relationship between national and international law, role of the individual, Regional Human Rights protections (mainly European Convention on Human Rights compared with the American and African ones) and Universal Declaration on Human Rights. Please use only books and academic articles or journals. no wikipedia.