The purpose of this chapter is to prevent acquisition or divestiture of control of an insurer or a holding company system of which an insurer is a part where such acquisition would be adverse to the public interest and the interests of policyholders and shareholders. A further purpose of this chapter is to promote the public interest and the interests of policyholders and shareholders by facilitating, consistent with those interests, better use of management skills and services, diversification through acquisitions, free access to capital markets, sound tax planning and open competition. An additional purpose is to monitor and regulate insurance holding company systems.