At the end of the first movie, a major battle took place in Mission City, leaving many casualties. And right afterwards, Secretary Keller is heard saying (before "What I've Done") "leaving no evidence..." as the military drops Megatron into the deepest part of the ocean. ......No evidence, but hundreds of bodies .... ookay.... Much later, during the middle of ROTF, The Fallen lashes out his attack and televises an international broadcasting regarding the hunt for Sam Witwicky (HEED OUR WARNING). And it just so happens that everyone in the entire world saw that. Now I don't know about you guys, but I highly doubt that the Sector 7 or NEST or whatever will be able to convince everyone on Earth it was a hoax. So what does this mean? Will it be like All Hail Megatron/For All Mankind, where the humans start capturing Autobots and blowing up cities out of fear? Should the humans seriously be that surprised by an invasion (in DOTM) when the Fallen already threatened one? Consult, my friends. Consult.