I don't think anyone is claiming that the destruction of evidence is right or good for society. On the other hand, do we really want to live in a world where everyone needs to be paperwork pack rats? One thing that I can assure you is requiring the retention of documents that provide evidence of a crime, while allowing for the destruction of everything else after seven years, wouldn't have the desired outcome. (Though it would be amusing to see which corporations have the largest indefinite data retention warehouses if it did work!)

I also think the right and good for society means addressing crimes in a timely manner, which likely means more auditing by independent bodies. Punishing someone for a crime that happened 7+ years ago may feel good, but it is meaningless for a couple of reasons. Should we be punishing people who have reformed? And for those who don't reform, should we be letting criminal behaviour occur across multiple decades?