Lots of people get themselves killed in fixed wing (of all types) and other rotorcraft.
Aviation of any type is very unforgiving of mistakes, oversights, errors and failures. Any of these will get you killed. Make sure you avoid these things, and aviation is quite safe. My brother in law killed himself in a gyro by flying into a powerline, as has many other rotor and fixed wing pilots. He made a mistake and it killed him. There are blokes out this way that operate gyrocopters that have in excess of 20,000 hours with only minor incidents.
If you are going to ban gyrocopters to stop people being killed, you have to keep going and ban all aircraft. All forms of transport are inherently unsafe.