"the local Sherif would in short order have an over whemling force of men willing and able"
I think you are kidding yourself. The local sherif and cops be be in the way, stopping a rescue until they can do it safely after the perps have run away. They would arrest you for trying to save your kid.
I suppose it would depend on where you live, but sherifs tend to see things the same as the local folks. Sherifs are elected and citizens willing to help when help is needed are part of a good sherifs tool bag.