Here is another argument "sort of" against BIC, but from an unexpected source (arch Equal parenting luminary Warren Farrell no less, in an interview with a UK father's rights campaigner):-
RW: You say in Father and Child Reunion that society's focus on the best interests of the child is often in the worst interests of the child. Too many fathers feel that.
WF: Yes. A child's best interest comes from the interests of everyone in its life being in balance. A child who grows up with only its interest being the focus of everyone' s attention is a narcissist-in-the-making.
Did you like that?? - As Fred Dibnah would have said if he'd still been with us (whose Fred Dibnah you may ask - Steeplejack Fred from Rochdale in Lancashire of course - steam engines and the rest of it - did his fame reach the US??)
All the best, Graham