It’s a free country, the parents do not have the right to silence the search for truth as hard as it is for them.
Exactly so. Legally the crime of murder rises to a crime against all society. It does not matter what the Rich family's "feelings" are. It is not about their "feelings". It is not their personal purview. The most grievous wrong has been committed against society at large and all avenues toward justice must be pursued and investigated.