There are at least two types of people who should generally never be given weapons.
One; someone who is afraid to do anything without a weapon.
And two; someone who thinks nothing CAN be done without a weapon.
And it is almost impossible to tell the difference between these two.
The first one will either only use the weapon against those who pose no threat; or else overuse it to prove he isn’t a coward.
The second one will either still do nothing because he thinks the weapon is inadequate; or he will try to do too much because he overestimates what can be done with it.