Other mistake: Assuming the Burj Khalifa is state-of-the-art, wouldn't random gunshots, sudden pressure differentials on the 119th floor and in the server room on the 130th, and having someone free climbing on the outside of the building (to say nothing of a person falling from the building) maybe have triggered an alarm or two, and perhaps a couple of security guards might have come up to check things out? Benji didn't have control of the alarms until after Ethan got to the server room.
Other mistake: When Benji kills Wistrum, the bullet hits him square in the back, even though Benji shot him from the side.
Other mistake: When Ethan drives a car off the edge of the parking ramp the car falls 100 meters to the bottom pointing nose down the whole way and hitting nose first allowing Ethan to be saved by its air bag. The car's angular momentum makes this impossible - the car would have tumbled back over front.
Other mistake: During the car chase scene in Dubai, Ethan pushes the clutch several times (visible in the leg-room shots). The car, however, has an automatic transmission.
Answer: Knowing he was trapped, he may not have wanted to be taken alive, preferring death over capture.
raywest ★