Fine, fine

make the blog whatever you will...but there should be no need to constantly justify its use. A person can have any number of reasons for maintaining a blog - why keep arguing whether the prime reason is correct or not? What is 'correct' here anyway?
Think of it the other way - perhaps, someone would actually like to hear from you. Maybe, what you really want to say is also useful for other people. Or, ermmm...it helps you discharge your tension in a people friendly manner. All I am saying is, there is no reason to hold back just because you think youll be perceived so-and-so, and therefore when you do write, preempt the possible attack by justifying oneself, or deflect attention through sarcasm etc(I know, I know!) - this is not a real-time strategy game!
And of course, totally agree with Abhinav on the innermost private thoughts vs public domain conflict - one must exercise self-censure, "Do unto others what I'd have them do unto me", modesty, or what-have-you.
@Obivan: You didn't spare any oppurtunity for launching "...attacks on me..." either, did you:)