Because you know, the hole was not big enough to be noticeable...
Luckily, no one was injured
Arden Hayes knows US presidents and geography probably better than you ever will and despite being really impressive, it's probably not the thing people will remember from this video, so be sure to watch it 'til the end.
As you can see here, they have since then cut the end of the video for advertising reasons obviously.
This scene from just released video game Call of Duty Ghosts (right) is nothing but a lazy copy of the ending of Call of Duty Modern Warfare 2 (left) released in 2009.