The main reason for this is that there is a need for more kinds of regulation as life has gotten more complex. When most people lived on farms and worked for themselves, there was little need for government regulation. As our lives have gotten more complex, we have come to need (or feel that we need) government regulations for things like the cars we drive, our education, the cell phones we use, and many other things. There are so many things going on in our world that we need to (or think that we need to) have a bigger government to regulate all the new things that happen in our society. Our more complex lives mean that we need to regulate more things and we need a larger bureaucracy to do that regulation.