Hmmm
Well I have some unsupervised neighbor kids and I've gotten so sick of how they behave toward mine that I have just told my kids to stay away from them.

: (I've already decided that if I see them running around in the road and everywhere like I did last summer, I am simply calling CPS to check--there've been enough complaints I think this person should *know* the ones who are supposed to be supervising are NOT doing their job. But that is another thread entirely. And I am NOT a 'call" kind of person, but seriously, these kids are my kids' age, they're *supposedely* being supervised by older siblings, and in reality, they run around all day long in the parking lot or whereever they want to be and you rarely see *anyone* so much as be on the porch watching or anything.) I *used to* be nice and let them come join mine with toys in the yard, it always disintegrated. This year, on our FIRST DAY outside, my kids were out riding bikes with my mom walking and one of them pushed DD off her bike. For NO reason, just because she rode by on the sidewalk. AND--the 'babysitter' stood there and watched it and did *nothing*. We'll be at parks a *lot* this summer. (not to judge, but if MY child did that---you'd see me *do something.* probably make my kid come inside.)
It's an apt. complex, our yards are adjoining, no fences and that sort of thing.
My kids ride bikes outside with me keeping tabs looking out the window sometimes--like if I'm cooking. We're talking they are going up and down the sidewalk, I can see most of the path, and I am physically at the door checking as often as possible.
If my kids were to happen to do something and I didn't see it, I have absolutely NO problem with a neighbor saying something to them, or even coming to me.
I *would* have a problem with a neighbor *punishing* my kid. That's for ME to decide, if it's that serious of an issue, everyone knows where I live, bring the kid to me.
That said, my kids are not typically unsupervised long enough for something that drastic to happen!

Back to the original point, no, i absolutely would not have a problem with someone telling my kid not to throw wood chips or do things that might hurt their toys.
*I* would *want* to know if it was an ongoing problem. Some others might not. (like the neighbor I've given up on, I know the manager has talked to her, other neighbors have tried to talk to her, nothing changes.)