The situation here is relatively simple. Keanu Reeves allows himself to be pressured into thinking that he can jump across buildings because he is in "the matrix," where among other things, the typical laws of physics generally do not apply.
Looking at the distance between the buildings that Keanu is going to jump across, a conservative estimate would be that the distance is at least 50 feet. Further, the world Olympic record for the long jump, an event which most closely approximates the physical activity which Keanu is about to do, is just under 30 feet. With a little bit of research, Keanu would have realized that his jump across the buildings was not humanly possible. Perhaps though, he thought that he was a higher caliber athlete than an Olympian? If this was the case, then I fear that Keanu may be afflicted by an over-inflated ego.
Really, this rash decision by Keanu is a textbook example of someone giving in to peer pressure. He seems to justify his actions by saying: "Oh well if Morpheus can do it, so can I." This logic is flawed though. Morpheus clearly possesses superhuman traits, as evident by the fact that his glasses never fall from his face in spite of having no temples ("temples" are the arms of the glasses- see below diagram for further explanation), and Keanu, at this point in time, is clearly one or more steps below Morpheus in terms of overall ability.
Overall Rashness of Keanu Reeves' Decision to Attempt an Impossible Jump Between Buildings: 6.2/10Skills Demonstrated by Keanu Reeves: Failing at Jumping (10.0/10), Theatric Falling (7.1/10) Acceleration (5.4/10)

