I agree, the most dangerous aircraft to fly is one that has just come out of maintenance, or a routine check
It happens throughout aviation, big and small. One of my partners was taxiing our C172 out prior to flying when it became apparent one of the wheels was not properly tightened. It had just come out from a 100 hour service ! Further investigation showed that the engineer who was putting the wheels back had got called away to the phone, then forgot where he was up to.
Also very sad to note that a crash of today's magnitude got NOT A SINGLE MENTION on the BBC's main ten o'clock news. Because so much of the programme was devoted to the tragic events in India.