Does Thumper’s mom’s advice still hold true?

I’ve been away from blogging due to illness, but I’ve been reading blogs, and recently I read a writing centered blog where a bunch of novels were disparaged. Now, everyone has a right to theit opinion, but reading that I wondered if Thumper’s mother’s advice no longer applies. Remember, “if you can’t say something nice, don’t say anything at all?”

This was the guiding principal of my childhood, and I’ve said it to my children. While, it has it’s flaws (the squeaky wheel gets the grease, etc.)
I believe spreading positive messages rather than negative is good for the both the person doing the praising and the people around her.

I suppose, of course, me even starting this conversation flys in the face of this aphorism, but I think blogging has in someways licensed us in the opposite direction. Not only do we express very negative thoughts, but we are encouraged to do it. The nature of people is such that various rants and alarms get more clicks, than expressions of gratitude and good tidings.

What do you think? Is Thumper’s mother’s advice still valid? Or is it an outdated concept we should stop advocating?