I agree that LDS folks are generally "nice." When you mentioned the Book of Mormon and niceness in the same graph, tho, I immediately thought of the not-so-nice Mormon Jesus depicted in the Book of Mormon.
When you read 3 Nephi 8 & 3 Nephi 9 look at how the Mormons depict this dying Jesus on the cross! It mentions 16+ cities completely destroyed along with all of their inhabitants supposedly here in the Americas...The Mormon Jesus repeatedly claims in 3 Nephi 9:1-15 that He destroyed all of those people & their cities! (So at the very point he's supposedly saving them from their sin, he's killing off 16 entire cities! Can you imagine news coverage of "President Romney" attending his Easter Sunday service where our loving Christ is portrayed in this manner from MSM coast to MSM coast!!!)
Ask Lot and Moses about other people destroyed by God. And don't even think about the people killed in the name of various "religions" since the time of Christ.