Which accidents are you referring to?
Latest have been
A340: Runway overshoot, so the aircraft was not flying when the mishap happened.
-Tuninter Atr 42: Fuel starvation, couldn't glide to a safe landing because closest airport was too far (and 2 non-functioning props add a lot of drag)
-Helios 737: pressurization failed, pilots incapacitated, flew until fuel finished and then crashed into a mountain.
-West Caribbean MD82: Both engine failed+control problems (stall?), crashed into swamp
-TANS 737: Flew through thunderstorm, crash-landed (windshear?)
-Mandala 737: Crashed shortly after takeoff, at very low altitude there is little room for an escape maneuver if a major malfunction (thrust loss, control issues) happens.
An airplane can glide if thrust is lost, but most of commercial airliners are not very efficient when it comes to gliding, there must be an available runway at close range. Things get even worse if other issues happen, such as control problems.
If God had wanted men to fly he would have given them more money...