The same happened in Germany where the BND (German NSA) destroyed evidence, most likely because of obligations to allies like NSA. Then the state safety agency

The same happened in Germany where the BND (German NSA) destroyed evidence, most likely because of obligations to allies like NSA. Then the state safety agency (Staatsschutz), something like the secret service to uphold the constitution, destroyed evidence and obstructed investigations in a decade long Neo-Nazi killing spree. These orgs operate, and maybe have to they way they are set up, with no real oversight and anytime other branches of government want some info they accidentally park their computers in an MRI machine during lunch hour. Edit: The Staatsschutz did that to save their own skin because they had moles inside the neo-nazi groups and probably wanted some info to be buried deep. What the BND destroyed and was made public not that long ago were something called "selector lists" for mass surveillance in partnership with the other big brothers.