In defence of the 737.
The boeing 737 is one of the safest public transport aircraft.
Aircraft such as the 737 have an outstanding safety record. You should be aware that most accidents are pilot error. How many years has Qantas been flying 737? How many serious accidents? 0.
Flying a 737-800 is very safe occupation. The public should feel very safe when they step onboard a 737.
Sure if you run a 737-200 on next to no maintenance and have overworked undertrained pilots flying them in awful weather, then yes accidents occur.
The level of safety on a 737 is very high. You consider the amount of hours flown, the weather they fly through, takeoffs, landings, temp changes, and speed flown.
The 737-800 is a very safe aircraft. The 737 is over engineered. You fly a 737 within a envelope of safety. Very few 737-800 are pushed to thier operating limits, if every.