The short answer is, because they claimed the right.
They wanted to be treated right.
The patriots were for independence. Those who were loyal to the king were called loyalists.
The reaction of a loyalist to the Declaration of Independence would have been that colonists do not have a right to simply declare their independence. Colonists are subjects of the crown, whether they agree or not. King George III rules by divine right. God save the king.
No one, colonists didn't realize this until Britain's taxes became extreme. This is when the revolution started for independence.
Yes, of course they were. They felt that freedom (Independance) was a God-given right of humans.
Yemen obtained its independence from its colonists in 1918.
Croatia obtained its independence from its colonists in 1822.
Georgia obtained its independence from its colonists in 1776.
Hungary obtained its independence from its colonists in 1001.
Portugal obtained its independence from its colonists in 1143.
Mongolia obtained its independence from its colonists in 1206.
Thailand obtained its independence from its colonists in 1238.