Maybe "points to", but crime solving needs something that categorically rules out any other possibility beyond a reasonable doubt, which I don't believe is possible, as the police didn't seal off the property and seriously investigate for evidence of an intruder.
And if the evidence is strong against the Ramsey's, why have they never been charged?
Until someone is charged and the evidence presented in court, and someone is convicted, every crime is unsolved. So at this point it is all just speculation. The word 'proof, just means 'my personal opinion'.
JMO