Jacob 2: 29 Wherefore, this people shall keep my commandments, saith the Lord of Hosts, or cursed be the land for their sakes. 30 [bold]For if I will, saith the Lord of Hosts, raise up seed unto me, I will command my people; OTHERWISE they shall hearken unto these things.[/bold]

In other words, when the Lords commands it, polygamy is acceptable. If Joseph Smith was a prophet of God, then you have to accept that God told him to bring the principle into practice. After all, this dispensation is the RESTORATION of all things, therefore, the principle of plural marriage was restored.

The problem is, critics of the LDS Church use scriptures selectively, and not fully, in their arguments, therefore their interpretations are faulty of what LDS teachings really are.

The argument critics use in conjunction with the scriptures you refer to are that David and Solomon were condemned for having plural wives. Not so. What were the wrongdoings of David and Solomon? Was polygamy the sinful act they committed, or was it something else? Obviously, polygamy was accepted by the Lord at times, since many of His prophets participated in the practice. In fact, the Bible says that God gave David his plural wives: