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Vibrasphere, I actually think the 'could haves' in this instance did warrant police or authority presence, this is my opinion anyway. The teenagers were causing a public disturbance and being irresponsible, it needed for the 'offending' fireworks taken away from them. I'd rather action be taken before one of them or a toddler had got hurt, when it would have been said, if only something had been done before! It's just luck that no-one got hurt. I don't begrudge a group of teenagers being together in the park, I was one once and wondered about parks and streets myself. But I was not playing with fireworks and being irresponsible.
To everyone else; My brother had a bad experience with a load of teenagers before, he did politly ask them to move away from outside his house where they were being loud & rude about 10pm, his kids were in bed and were being kept awake. All he got in return was abuse, they got louder and kept coming back for a few nights .. he felt helpless! What are you suppose to do! In the park he didn't want the same repercussion infront of his own children. He did what he felt appropriate at the time, but wondered if there was another action he should have taken.