That definition came out of webster dictionary. Check it yourself.
http://www.webster.com/dictionary/terrorism
Our founders were terrorist, they commited criminal (indeed traitorious) acts against the state, destroyed property (boston Tea party), hijacked state property (where did you think Henry Knox got his cannons?), and attacked the soldiers and officers of the British Empire. All of these acts were committed for a political purpose, the independance from the British Empire (politically motivated) if that's not terrorism then i don't know what is because that is exactly what the insurgency in Iraq is doing to our marines.
There is one key difference between our founding fathers and Osama Bin Laden, our founding fathers were committing terrorist acts to build a brave new world; a world where the people would govern themselves, a world where people can speak up against their government without fear of reprisals, a world where people and believe in their choice of religion. What our founding fathers (and mothers) were fighting for that makes all the difference between our founding fathers and religious fundementalist. And that is why our founding fathers are held in such a high place in history.
Our founding fathers are not supermen, they were regular joes, some of them rich joes, but they were not perfect. How else can you explain how they were preaching freedom on one hand while at the same time own slaves? But that is what made our founding fathers so great, dispite their flaws, dispite their acts, they were able to make a great nation that holds true to its promise of life, liberty and happiness (even though it did take some time for everyone in the nation to reap those benefits).
Sorry for the rant, but i just hate how k-12 education in this country draws out our founding fathers as perfect people and can do no wrong; which in my opinion actually deminishes their greatness.