Everyday 300 Toyotas of the same type crash!
There is a statistical difference between 300 examples of the same type experience the same technical malfunnction or one only one example with 300 pax does the same.
If you would have grounded every aircraft that crashed, there wouldn't be any aviation anymore. The only aircraft that never crashed is the A380, and it is only a matter of statistics until one does! (Heaven forbids.)
Dani