Neighborhood kids cursing and scaring children

First, let me state that I live in a very quiet and friendly subdivision. My house is on a court, and we who live in the court all have young children. (under 10), Our children enjoy playing in the court where there is little traffic other than each other coming and going. We are all very neighborly and there has never been issues.

This past Christmas, we purchased a new basketball goal for my son to play with. The neighbor across from us happened to purchase one for her son as well. We set them up on the outskirts of the courts, in our own yards so that the children could play safely there.

It seems now, that some teenagers from other parts of the neighborhood have discovered that these goals are here, and in a place with little to no traffic and have gotten in the habit of coming to play ball pretty much on a daily basis. I normally wouldn't have any issue sharing the space or even our goals if it weren't for their behavior.

They curse endlessly while the younger children are out, and tend try and scare the younger ones off. They spit and yell and throw trash at the dogs in the courts (who stay in their own yards, might I add) and some even jump up on cars or mailboxes when the dogs go out into the yard to use the restroom, even though they are fenced or leashed. They run the young ones trying to ride their bikes or powerwheels off the "court area" while they are playing. They also are pulling the goals down to low levels so they can dunk, and we have had to replace the screws twice already. They have been hanging on the nets themselves as well.

Many of the parents are just pulling their children inside for fear of vandalism if they say something. I feel like, while this is a public street, we as homeowners around it should not be subjected to this behavior. We live in a nice neighborhood, and I don't understand how parents are just letting these kids roam wherever. They stay for HOURS. All day on the weekends. I don't have a problem with them being there, I just have a problem with their behavior.

I am in the right to say something? Is there anything short of pulling the goals onto our driveways that we can do? (although I'm pretty certain they would pull them back out, because I saw the neighbor try that). We do not have a HOA. I really am trying to be neighborly here, but I feel like My children have the right to play there as well, especially since we live here, and these other kids do not.

Advice?