You may be well aware that any part of the human body hit by the moving blades of the turbine will be hurt. However, flying birds may not know about this. They are liable to be hurt by the turbine blades if they are unlucky.
Wind turbines must be strong enough to protect itself under the wind environment they are operating.
A wind turbine must not be installed where the path of the blades can be reached during normal operation.
Installation of the wind turbines must be secured properly on the towers or posts such that they will not be dismantled under strong winds. It is very dangerous when parts of the turbines come off under strong winds at high speed. The result may be detrimental.