Maybe they've learned that terrorists always misspell "lightning". After all, these are our skilled tacticians in the war on terror. Oh, sorry, it's not "war on terror" anymore.
Inability to spell aside, though, in what possible context could some of these terms be indicative of some nefarious scheme? Erosion? Help? I can't imagine flagging every email or post that contains the word "help". And it must be some evil genius who can turn erosion into a weapon of terrorism.