Any stormtrooper knows that it probably a good idea to stay away from a firefight.

The blaster, standard issue, was known to have severe aiming issues.

A stormtrooper using such a blaster was considered a marksmen, if he managed to shoot the target accurately one out of one hundred times. This is possibly the reason why it’s far more likely an angry stormtrooper using his blaster would be found guilty of manslaughter rather than murder, as there is no way the stormtrooper could expect to kill anyone with this weapon.

It is thought that the emperor was responsible for the blaster being inaccurate as he wanted to safeguard himself from storm trooper coup attempts.