Because Freemasons swear allegiance to Freemasonry above all else!
Two Freemasons’ lodges set up for members of parliament and political journalists are continuing to operate secretly at Westminster, the Guardian has learned.
New Welcome Lodge, which recruits MPs, peers and parliamentary staff, and Gallery Lodge, established for members of the political press corps known as the lobby, both remain active, according to Freemasonry records.
A third lodge called the Alfred Robbins Lodge, which was also set up for journalists, also continues to meet regularly in London.
The identities of the members of these three lodges remain unknown outside the world of Freemasonry, however, and so discreet are the members of Gallery Lodge that few journalists working in the lobby appear to be aware of its existence.
...David Staples, the chief executive of the United Grand Lodge of England (UGLE), the governing body for Freemasons in England and Wales, said there was no contradiction between the practice of journalism and membership of Freemasonry.
[source : Two Freemasons' lodges operating secretly at Westminster , The Guardian, https://www.theguardian.com/politics/2018/feb/04/two-freemasons-lodges-operating-secretly-at-westminster, 4th February 2018]
Has Staples actually read the oaths that Freemasons take, like not exposing this, that and the other when requested by a fellow mason?