By giving it secretly, it makes people wonder what the hidden agenda is. E.g.. A man comes home and finds his wife murdered. Instead of immediately letting the police know where he is, he lies a little even though he did not commit he crime. The police find out he is lying - what are they to think at this point? Exactly. That he murdered his wife.
Poland's central bank head calls story of Nazi train find a hoax (Reuters)
from the article: Magnate in U.K. scandal: I feared charges of a 'Jewish conspiracy'