I agree. It is garbage, but unfortunately there is an audience for it.
I'm sure that there would be an audience for dog fighting but you've got to drawn to the line somewhere. TV channels have a right to air stupid and trashy stuff. They even have a right to exploit adults of sound mind and body. TLC has crossed the line multiple times with child exploitation.
TLC knew about the molestation charges along with the Quiverfull movement's acceptance of sexual abuse against women. They chose to air it anyway. In fact, I believe that they gambled when it finally came out that it might be a ratings bonanza with lots of new viewers tuning in to see the show. The Thursday marathon wasn't an oversight, they were further trying to milk the publicity. They only pulled the show because the advertisers threatened to leave the channel.
At this point they are just a liability for the parent company and should go.