The whole point of diaries is that other people find them and read what you've put. I did once take to writing my inner thoughts on the computer at the end of other things I was writing and ended up faxing four pages of hideous stuff to my accountant so I don't do that now.
Withholding information that would get innocent people killed was the right thing to do, not a journalistic sin.
I was told my whole life, you're fat, you're ugly, you're never going to amount to be anything.