I'll tell you why it wasn't so clever:
1. they were her biggest supporters. past tense.
2. they know a lot more than they have let out, but now....all they have to do is reconcile the law with their past "misstatements", and she IS DONE.
3. Its not true, which matters, because if it was, george would have admitted it. Since its not true, they have no evidence, other than the biggest liar in America saying its true.
4. Even if it were true, (unleash the psychiatrist's), it doesn't explain that bizarre behavior of having sex all day following the day your daughter accidentally died, and all the bought off psychiatrist's in the world will not be able to make it plausible.
5. not to mention all the rest of it. sure, there are psychological behaviors associated with that kind of abuse, but dancing the month away after your child's death, either by accident or not, is not one of them.
and so on,
imo.