Jet engines in use on today’s commercial airliners are quite reliable. It is not uncommon for engines to operate for tens of thousands of hours without difficulty before being removed from service for scheduled inspection. However, engine malfunctions or failures occasionally occur that require an engine to be shut down in flight. Since multi-engine airplanes are designed to fly with one engine inoperative and flight crews are trained to fly with one engine inoperative, the in-flight shutdown of an engine typically does not constitute a safety of flight issue.

this is the interesting one. this is not something that we can control but yes we must go for the safety as far as these crashes are concern, not true that everytime passengers are the cause of the aircrash but sometime it happens.

i have seen a live accident when i was attending a parade in california long time back and a plane was performing some stunts there suddenly it came & crashed down to the ground at the same place where public was sitting. nobody got dead but 100 of people got injured and both the pilots lost their lives.