Shake the dust off...and walk away.
Think about it, Mormonism leaves someone's eternal destiny to the still wet behind the ears, under educated missionaries and laughs at adults seeking to awaken them to the Truth of the scriptures. Your eternal destiny means so little to PD that he merely posts the party approved websites and has no witness on his own. And what did Jesus tell all Christians to do ... what was the great commission, send your immature teens to evangelize the world? Hardly.
One reason I post so many scriptures is that too many Mormons have so little familiarity with the Truth of what The Word of God declares. Mormons are the produce/vegetables of the lds workshops. Theirs is not a meat filled life. They work so hard to appear good and righteous, yet they are no different than devout Hindus or devout Buddhist. In fact, they are probably not as kind as devout Buddhists because I have never met a Buddhist that was dripping with an air of condescension like I experience with Mormons.
My best friend form college called me one day when I was in my mid twenties and wanted to come visit ... I lived with my new family in B'ham, AL and he and his wife lived in E. Tennessee. I asked why the sudden trip down our way. He said he had something wonderful to share with me. Yeah, he had been born again and wanted to share that with his close friend! I too was born again because of the witness I heard and saw in him, in his enthusiasm. Sadly, after a few years of being beaten down by meds school and the tribulations of life, he became a Mormon, and went into a shell that has eaten him alive. Not once in all the years since has he ever mentioned it to me, yet we still lunch together and visit the gun range together occasionally. The only brief discussion is when I bring up the contradictions with Christianity found in the 'meat' stuff of Mormonism. You see, there is some reason why he is not enthused with the church he now belongs to. And frankly, he has so many psychological problems now, I doubt he would be able to make a coherent appeal to his 'religion'. Mormonism has effectively squelched his light as he lives a duplicitous life trying to hide his flaws, believing he must somehow earn that which he already has, so the Holy Spirit is not guiding him to transformational living, and it shows.
I would bet there are too many in Mormonism just like my friend, born again then trapped into the cult of Joseph Smith, snared in the judiazer trap Paul warned against, not realizing why it is that the still small voice has stopped whispering. Perhaps they take that to mean they've become so much better, but they know that's not true and it eats away at the peace they could have. 'After all that you can do' is so similar to the lie satan told Eve.
The invitation to be like Cain and demand acceptance on his own terms rather than God's Grace in Christ to transform the man is demonic, absolutely demonic. The depth of blindness we witness in the apologists at FR is strong indication of just how powerful is the demonic inveigling in Mormonism.