Why can the USA sign the Declaration of Human Rights, then violate it and even fight unjust wars with it as a reason and still get away with their crimes?

Article 3:
Everyone has the right to life, liberty and security of person.
Article 5:
No one shall be subjected to torture or to cruel, inhuman or degrading treatment or punishment.
Article 7:
All are equal before the law and are entitled without any discrimination to equal protection of the law. All are entitled to equal protection against any discrimination in violation of this Declaration and against any incitement to such discrimination.
Article 18:
Everyone has the right to freedom of thought, conscience and religion; this right includes freedom to change his religion or belief, and freedom, either alone or in community with others and in public or private, to manifest his religion or belief in teaching, practice, worship and observance.
Article 22:
Everyone, as a member of society, has the right to social security and is entitled to realization, through national effort and international co-operation and in accordance with the organization and resources of each State, of the economic, social and cultural rights indispensable for his dignity and the free development of his personality.
Article 25:
Everyone has the right to a standard of living adequate for the health and well-being of himself and of his family, including food, clothing, housing and medical care and necessary social services, and the right to security in the event of unemployment, sickness, disability, widowhood, old age or other lack of livelihood in circumstances beyond his control.

Because there is a peice of paper, and then there is $$$$$$$$$$$$$$$$$$$$$$$