No. If a child has a crappy mother, and that crappy mother is one of the key witnesses for the prosecution in the trial, then there is a very good chance that the defendent in the case will be acquitted.
That's total BS. It's not the child's fault that the mother is perhaps two french fries short of a happy meal. If her child was molested then that child deserves to have justice served regardless if the mother may be a fruitcake. Spare me the bullsh*t! Even a prostitute doesn't deserve to be raped!