I am surprised the “legitimate” LDS church has not squashed these radicals before now. This does not do the reputation of the LDS church any good. Understatement, I know.
I’m betting the whole idea behind the raid was an anti-Romney plot.
And what exactly can the mainline LDS church do to "squash" them. They are not members of the mainline LDS church and any of them that were have been excommunicated.
They really can't. The FLDS are living the laws of Joseph Smith and Brigham Young as written in official church books such as the "Journal of Discourses" and "Church History".
The two churches are identical except that the LDS are more ASHAMED of Joesph Smith and Brigham Young than the FLDS, and the LDS have spent much effort to whitewash their stories over the decades.