The Joint Declaration was agreed upon at an informal meeting of the European Chiefs of Police in London hosted by the National Crime Agency on 18 April.
Police Chiefs of all EU Member States and Schengen Associated Countries were invited, alongside Europol’s Executive Director.
Here is the declaration (pdf).
that’s a bad metaphor, because killing beeing illegal actually stops a lot of killing, but also killing is usually actually considered a bad thing while encryption is not.
making encryption illegal is like saying “we don’t want anybody to enjoy this good thing, because it’s also good for criminals” while with killing, not enjoying it is what non-criminals would have done anyway.