I disagree.
You are welcome to disagree, but you offer nothing to back this disagreement. From witnesses and behavior of the plane it is pretty obvious an engine disintegrated... Unfortunately it is a model of engine that has a known problem with failure and disintegration, and often that happens right at or following takeoff... It also just happens to be one of the most used engines on the planet, this particular engine was also from reports so far nearly at the end of its service life.
You want us to believe a bomb went off in the engine or that a missle hit the planes engine which then lead to its failure? Engine disintegrates on take off, damaging its wing and the plane.. causing wing it was part of to lose lift, wing stalls, plane banks sharply that direction, and plane enters nose dive. Witnesses clearly have stated that engine was destroyed, not holes in fueselage (which would be what you would see with a bomb in passenger compartment or in luggage compartment). It is just not bloody likely they planted a bomb inside an engine. More likely was a natural disintegration of an engine in a design that unfortunately is known sadly to have this defect.