Exactly, but ..... they do more harm -- the complete opposite of what they intended.
This action by George hits the headlines big-time and washes away anything good done previously, like a new attitude and re-baptism. Not only that but, his temper, the family's mutual anger and temper and extreme assertive control --- makes it highly plausible that KC likewise lost her temper and killed Caylee in the subconscious of the public -- they are so extreme -- despite any other evidence.
In terms of polluting the subconscious of the future jury pool, the A's are ensuring KC's fate 110% and taking themselves over the cliff with her.