[qaz123]

the volunteers that for the first few days showed up with food, water and clothes now seem to have lost interest.

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They haven’t lost interest. They realized they were dealing with savages and are too scared. All of this is the perfect example of “be careful what you wish for, you just might get it”. Put a stop to it now and send them back to where they came from. Only way to deal with it.

[Jeff Chandler]

the volunteers that for the first few days showed up with food, water and clothes now seem to have lost interest.

Such is the way with good-hearted volunteers. They seldom follow through for long.

[MortMan]

Put a stop to it now and send them back to where they came from. Only way to deal with it.

There is another way, but it involves even more cleanup than the way you describe.