I think Trump did not release the docs BECAUSE he was afraid for his family and friends, these bastards WOULD assassinate ANYONE to CYA!! Trump can NOT protect his ENTIRE circle!!
Also, by opening a counter-intel investigation they can hold the Mueller threat over Trump's head: obstruction of justice. They literally threatened Trump that if he spoke out to defend himself that would constitute obstruction of justice. (It is part of our new criminal code: if you attempt to defend yourself it is 'obstruction of justice'. Adam Schiff perfected the practice.)
On the subject of 'assassination', ex-police commissioner of NYC, Bernard Kerick (sp?) stated recently that if this Mar-a-Lago raid doesn't turn the tide against Trump, the cabal may resort to assassination.