Traditionally the flight crew has been the easy target in the blame game that ensues after an incident. In this case the regulator and operator too are indicted.
The shooting down of the Ukraine B737 flight PS752 by the Iran air defence system during a heightened alert is a human error with disastrous consequences. The relocation of the air defence unit and the misalignment of the weapon system is said to have initiated the chain of errors. However, it is incomprehensible how departing from Iran and rising, the reasonably sized signature projectile can be considered as a threat.