It's not a requirement, but does seem suspicious.
Where is the video from Costco ?
Would you run down your list of hoaxes for our edification?
Sandy Hook. Check.
Orlando. Check.
How about Fort Hood? Did that happen? No video of all the carnage there either, which seems to be your requirement.
Gabby Gifford? No video.
The movie theatre in Colorado? No carnage video from inside.
It's not a requirement, but does seem suspicious.
Where is the video from Costco ?