Obviously Casey Anthony has serious common sense behavioral problems evolving from a dysfunctional family environment. I can’t begin to comprehend the family’s actions in her child’s death. That in and of itself leaves all options on the table. That they would act completely irrational by staging a homicide over a possible accident or accidental murder is totally plausible in context - but being mentally ill is not a crime and you can’t convict based on a bizarre, sociopathic thought pattern.
It is better that many guilty go free than that one innocent person be found guilty. Always. No matter who the defendent is. No matter what the crime is. Even the death of a precious little girl.
Is it better that many guilty go free than one innocent person found guilty if those guilty kill again? Try telling that to their families.