To dream of a firing squad represents feelings of inevitability of total failure through a number of very personal embarrassments. Feeling scorned, condemned, or judged by peers. Waiting for a reprieved that only punishment can give you. Feelings of deserving punishment you can’t escape.
Negatively, may be a sign that you are too resigned to your guilt or too excepting of an inevitable punishment.
To dream of being one of the people aiming a gun at the guilty party in a dream may reflect feelings of inevitability of your revenge or punishment towards someone else. Harbouring scorn, condemnation, or judgement of others.