Have you ever thought we should have buildings made entirely out of planks?
And then, what would happen if someone came along with a giant catapult shooting balls at these structures?
Yeah me neither...
Despite that, some people find it fun to simulate structures made out of planks and then crashing stuff into them, posting the videos which are extremely entertaining to watch.
These videos are created with a very good (and free) software called Blender. If you're interested, there are many tutorials and manuals out there to learn and create your own stuff with it. Or you can keep watching videos of things being destroyed and great animation.