Thanks for sharing. Peculiar as I am Dutch, living in The Netherlands and I do read news-apps but did not notice or was not made aware of this open letter. I guess most news agencies did not care to report about it but I can be wrong. My wife is PIMI but she did not ask if I had read something, nothing. No indication she was aware of this at all.
Regarding the contents: it seem of low to average quality. Normally you do not attack openly a leading civil servant like the Minister of Justice, in particular if you realize that this person has the power and authority to take steps against the organisation.
The arguments are not made to build bridges but actually are more to limit any opportunity to come to a common agreement or understanding.
The NAZI reference is the nail in the coffin in my view as it is fully besides the point.