Under-age driver

Since this question has to do both with a neighbor's actions as well as our landlord's apparent lack of response to these actions, I wasn't sure whether to put this in neighbor law or landlord/tenant. That said, here's the question.

We live in an apartment complex. One of our neighbors has a 14-year-old son whom she allows to drive her car on the premises. In our state, he is an underage driver, and our local law enforcement confirms that this is illegal.

Tonight, myself and at least one other tenant witnessed him driving on the property with a younger boy hanging out the passenger window and two teenage girls hanging on the roof of the car. During this same time, he nearly hit another tenant's vehicle. We called the police to report this, but they said he has to be caught in the act for them to take any real action.

We have complained to the landlord several times about this -- including a couple of letters -- and while they agree that this is unacceptable behavior, she still remains a tenant.

In apparent contrast, we've received letters in the past from the same landlord warning about the terms of our lease and subtly implying eviction for sitting on our front porches.

It seems that there is a disparity in the application of common sense here. Is there any recourse we tenants can pursue to have this neighbor removed or to take some action against the landlord for allowing this dangerous behavior to go unchecked?