He was removing the right of the people to have a say in their government.
By getting rid of colonial legislatures and vetoing laws, King George III was abusing his power as King. He was going against the will of the people and took away their ability to influence government actions. In other words, the colonists were no longer being properly represented by their government. This would be one of many problems that the colonists encountered when dealing with King George III. Ultimately, these problems would lead to the United States declaring independence from Great Britain.