Because the law believes first and foremost that a child needs its mother and that the mother in question will use her (assumed) maternal instincts/good judgement to look after the said child.
As we know, this is a bad idea in a lot of cases because the mothers in question are exactly that, questionable.
Hope this helps.
As we know, this is a bad idea in a lot of cases because the mothers in question are exactly that, questionable.
Hope this helps.