It was the same in Northern Ireland back in the early days of the IRA. British soldiers where seen as the bad guys for shooting kids. What wasnt so publicly known was that the IRA was giving toy guns to kids to play with, then giving them real guns and telling them to 'go up to that soldier over there and pull the trigger and say bang your dead'.
Whilst this only happened a few times you can imagine the reaction of soldiers being confronted with a gun being pointed at them. If they wait to see if it is a prank they run the risk of being shot by an innocent child.
Great Minds Think Alike, Greater Minds Think Independantly