People running large organizations generally try to increase their business by increasing their customer base. This rewards them by increasing their income and influence. It's the human nature of personality types that gravitate to running large organizations.
Now what if the large organization is a government entity? How do they expand their "business"? How do the people running them increase their income and influence? They do it by increasing the output of their "product". Unfortunately for citizens, the government's "product" is regulations and control.
TLDR: Due to human nature, unless some definite boundaries are set in law, any government entity will eventually try to expand its powers and influence.