Imagine being frustrated about a new tax and going into the basement to scream. Great, you've had a little therapeutic outlet but unless the people who levied the tax are in your basement it will not change anything.
I'm just as irritated as the next guy when it looks like an injustice might be perpetrated through the passage of a new bill or some court ruling. I want to do something and I want to be efficient when I do it.
At first blush the e-petition seems like a great way to influence the powers that be. Get thousands of people who agree with you and have them all sign it, but there are a number of problems with it.