Founding principles are the bedrock on which a society or movement is based; they are resistant to change. Here in Utah, the Mormon Church was founded with polygamy as one of its founding principles. Although illegal since Utah was admitted to the Union, polygamy is still practiced by some outside the church, but living in the community.
One of the founding principles of the United States was slavery. Although now illegal, slavery is still alive today embodied in the way minorities and people of color are treated by a portion of the majority. One hundred fifty years after the abolition of slavery in the United States, many people in the country still will not accept people of color as equals deserving the same rights as most of us enjoy.
Founding principles are a powerful part of our lives and change very slowly, if at all.