I require data to do my current job. If you do not provide me with accurate data or you do not allow me to gather the data necessary, I cannot do my job successfully.
Do not ask me to do my job without the data, as you won’t actually get what you were promised. You will in fact get garbage.
And when everything blows up in our collective faces, do not pile all the blame on me….you will be just as guilty for not providing me or allowing me to gather the data I needed to perform the job you asked me to do.