Why Is the Revolving Door Viewed in a Negative Way

Why is the revolving door viewed in a negative way?

A) It is a major cause of government size increases, as money that has been saved from one agency gets doled out to another.
B) It has raised questions about possible insider industry influence over regulatory agencies and decisions.
C) It has limited the success of sunset reviews by transferring the work and funding of a recently dismantled agency into a new agency.
D) It has raised questions of increasing nepotism with the hiring of agency heads and other senior public officials.
E) It has prevented younger generations from entering into the public sector by cycling current government employees around to various agencies.