But if I come across a person that I think is sincere and is in dire need of help, I might help (without making any noise and letting anyone know).

This would be a good time to bring the issue of noise up.

I have a SFR close to Wake Med that is nearing lease end and am all ears.

Find yourself a good local housekeeper, treat them well with the occasional bonus and they will be your eyes and ears. 

And for the same reason we don't put table saws in our living areas (yet) its stupid to put dishwashers, mixers, blenders, and other noise generating kitchen equipment in the same room.

Landlocked property has an easement over a 1/4-acre ell in the neighboring property that otherwise blocks the property from the road and is largely (desirably, for privacy/noise) covered in trees. 

Quote from @Zhen Yuan: Use the tool between your ears.

I opened a new host account to handle guest interactions myself, hired a local handyman for emergencies, and found a cleaning person who could also act as my eyes and ears for any required handyman services.

All of those concerns out in the open, I'm all ears.

For example, if the police came out and cited them for excessive noise at night, I would issue a lease violation warning and cite the lease term about not disturbing neighbors.