On Saturday a B737-800 crashed into the sea just before reaching the runway of Bali.
Some "analysts" and "experts" were quick to question Lion Air's safety in the light of the quick expansion and rapid growth of the airline. They did not care to wait for what the pilots had to say about the accident and what had caused it. As we can read here the pilot has about 15,000 flight hours and is a flight instructor and the co-pilot, who was in charge, has about 2,000 flight hours so I would rule out any reason relating to inexperience of the flight crew. It appears that the reason was weather related, heavy rain and a wind shear or a downdraft might have caused the crash.
As safe as today's aircraft are - there isn't any powerful force than mother nature. We should never forget this! Even the safest airline can't be "safe" enough not to be prone to the forces of nature.