Read these words from the Declaration of Independence what is the main purpose of this section of the document

The first part of the declaration of independence explains that if a group of people want to collapse the government, they should tell us why they wish to do this.

"When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another, and to assume among the powers of the earth, the separate and equal station to which the Laws of Nature and of Nature's God entitle them, a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation."