What is to physically burn a book?
Ignition temperature is the temperature at which something catches fire and burns on its own. The ignition temperature of paper is 451 degrees Fahrenheit, or 233 degrees Celsius.
A published book is a permanent vehicle [and almost unchanging and unflinching medium. The reader can write on the pages notes and criticism. The reader can redact words and sentences with a magic marker or simply rip out entire pages from the binding...] for a wide variety of political, social, and cultural messages.
The symbolic protest of destroying a book comes when the destroyer and his potential audience knows the political, social, and cultural messages held in a specific book targeted for destruction.
I for one, (though I have never told a single soul this) have destroyed/burned my own personal diary I had written while I was deployed in Iraq during the first Gulf War. Burned and buried the notebook in the sands of Iraq while on guard duty. Much of the content of the singular copy/diary is now gone to lost memory and the inevitable degradation of the books ashes.
I can't say how much of a loss to the world was the destruction of my poorly thought out whiny prose of my war diary but in the grand scheme of things, it didn't register as an itch on the universe's behind. There was never an audience for my diary as it never came to a public fruition.
On the other hand, destroying a television? The theory and practice is just plain stupid. The television itself is not the message but a technological tool. If your going to burn a book out of an ideological protest, what kind of protest would it be if you burned a book with empty blank pages?! Okay, you could in theory film the book burning and then call yourself an avant-garde artist but that's a different story.
A television is nothing but a blank diary and the writing can be either by over the air broadcast, via cable television streaming, or direct connection to a DVD or VHS player. The television could also be an empty vessel for a fish aquarium. So basically the act of destroying an empty/contentless television is a useless and senseless Luddite act of destruction/protest.