I think people can argue all they want about making exceptions to various beliefs in various circumstances but I for one am happy privacy absolutists and people like RMS and the like exist.

Police have more than enough tools to catch people using encryption without the ability to compel people to decrypt data. At the end of the day if you have to try force someone to enter a password or fetch you a key then you already fucked up and should have to admit your failure and try assemble a case with what you were able to get before you fucked it up by not getting the data in-flight or otherwise unencrypted.