The default outcome for AGI is likely bad (http://singularity.org/files/ComplexValues.pdf and http://singularity.org/files/SaME.pdf), but not in the ridiculous way that movies portray it, and no one should be using the movies as a substitute for thought (http://lesswrong.com/lw/k9/the_logical_fallacy_of_generaliza...). There are so many types of AI minds, and so many ways for it to go wrong (http://wiki.lesswrong.com/wiki/Paperclip_maximizer) that picking out a very particular fictional one to stress over, make movies about, and attempt to constrain (even framing it as a constraint problem of some more "primitive" desire to destroy humanity) as the only default mind, is pretty silly.