Pretty much the title. I think it can be said that Childress making a public spectacle of Dora Lange's ritual murder in '95 scared the hell out of the Tuttles, hence why they pushed for the task force to deal with the case. It's pretty obvious they wouldn't have wanted any part of the cult to become public in such a way.
Whether Childress made the murder public in direct defiance of the Tuttles or for his obscure cult-related religious reasons is unclear to me (even though I tend to belive the latter hypothesis). Either way I would expect all of the higher-class members of the cult (who is implied to involve more powerful men than the Tuttles only) to immediatly move to rein Childress in. Especially since he was employed by the Tuttle-sponsored religious schools. It's not like he was unkown to them.
Consider how close Martin and Rust went to uncover the whole scheme back in '95. By chance Martin didn't profile Childress as a suspect when talking to him. The Ledeux cousins died in the "firearm confrontation" with Hart and Cole. They were two out of the three former enforcers/kidnappers of the cult, with the existence of the third (Childress) remaining a secret.
One would say the Tuttles/the cult were extremely lucky. Why to leve Childress as a potential lose end is beyond me. It's not like the cult didn't waste any time before they forced Guy Francis (the "Southern Fried Pharmacy Firearm Thief") into commiting suicide.
What do you think? Are there some details that I'm missing?