We believe and live Plural Marriage because it is a commandment of God, and we fear God more than man.
In the 1800's the U.S. Government sought to legally destroy all who believed in it, and eventually succeeded in causing the LDS Church to compromise under the pressure. In today's society, however, we find that the liberal government is far more permissive of non-traditional families. If states can decide on the legality of homosexual marriage, then surely plural marriage cannot be so intolerable.
In living our beliefs, we do not break any enforceable laws. We do not obtain marriage licenses for successive marriages, and so are not guilty of bigamy. All parties are consenting adults and are fully aware of the arrangement, so there is no charge of infidelity or adultery. The only man-made law that is breached is that of "unlawful cohabitation", of which an immense number of citizens of the U.S. and other countries who merely live together and copulate are likewise guilty, thus rendering the law unenforceable.