Unless it's been dumped across your front door, or is being driven around the area by spotted yoofs throwing McDongals wrappers out of the windows, then it probably isn't your concern. Especially if you keep making a fuss about it, as you stand a fair chance of becoming that person...
Don't the Police and other law enforcement authorities rely enormously on information or intelligence passed to them by members of the public?
If every law abiding member of the public / community felt reporting incidents 'isn't their concern', then the authorities job would become exceptionally harder than it already is. Reporting these matters brings small incidents to their notice; an incident that get continually reported should eventually get some action, even if nothing appears to be done as a result of the initial report.
You should never under estimate the value of reported incidents - how many serious crimes / incidents have eventually brought the perpetrators to justice with a small shred of information / intelligence that many would have thought was insignificant at the time? Looking the other way or having the mind set that 'it's not my concern' is burying your head in the sand - especially if it affects your own community.
Exactly right!

I KNOW Kent Police at least, but really all Police Forces, rely very much on "intelligence" and the public informing them of actual crimes taking place and the possibility of those in the process of taking place, let alone information after a crime has been committed.
Although I am an official advisor for Kent Police with a badge to match,
every member of the public has a duty to report anything of concern, no matter how small and incidental it may seem, if there is a possible breach of the law or simply suspicious activity.
That is the only way that our society can be served and protected.