My guess is that the Kenyan Mall shootings was a “test run†for things to come here in the U.S. The terrorists gave it a go and now that they know how things turned out, can go back to the drawing board to work on the corrections necessary. (Tin hat theory? Maybe? Then again, maybe NOT).
Simon Property is the big mall owner in the US.
If you want to speculate on your theory, short SPG.