The Heli pilot is in the wrong. Less he was filming an incident he should have been at a higher altitude.

Check the FAA restrictions on your area. It's a park right, so it's a populated area. At tree top level, any person in the area, house, car etc. he puts in grave harm. Should something mechanical happen to the heli, at that height there is no time for correction, auto rotation etc. He easily could have killed someone.

REPORT HIM TO THE FAA FOR UNSAFE FLYING PRACTICES. He knowing flew into harms way... You'll need the N number and or the news agency he works for. Looks like he needs to be grounded or fined.

Your club, if they want to use the park they need to work with the FAA to resolve this. Work with the City, and park service too. Tree top level is way too low for any civilian aircraft period. I'm sure a competing news agency would love to do a story about another news chopper endangering the public.