I think some sites are set up by people who were never really LDS/Mormon and they have an agenda, whether it be hate or political or both I don't know. There are also sites set up by people who really do have hatred for the LDS/Mormon way through bad experiences, and the sites are a kind of catharsis for the individuals/groups concerned.
I was baptised a catholic, and when I was a child I fell victim a couple of times to predatory paedophiles who were priests. It is my opinion that the Catholic church spent many years protecting these scum and many more in their ranks. There have been several major scandals since then but it still goes on. I could have walked the path that led me to shout from the rooftops about my hatred for priests and the church itself, but the fact is that I don't hate all priests and I don't hate the Catholic church. Not every Catholic I ever met was cruel to me and I held on to that. not everyone can.
I'm not saying that the reason some people grew to hate their Mormon faith was due to sexual abuse, there are surely many reasons why people lose faith, I'm just putting forward what happened to me and how I could have taken either path.
I would like to say that I feel I'm a quite tollerent person, and I've forgiven many things and many people (myself included), over the years, but as an adult I did chance to meet one of the priests concerned, and despite how awful this may sound, I'm happy to say that he has been wheelchair bound since that meeting, and because of my actions during that meeting. What I'm trying to say is that my hatred was for that individual and one other only, but some people just seem to have to lay total blame on all they see before them, and that is why they go to such lengths to attack them, not just LDS but all religions.