It would be far better for UPS to refuse delivery to neighborhoods likely to shoot UPS guys.do you not carry a your own first aide kit with you daily? i always have a trauma IFAK (individual first aide kit) and a general knicks and cuts kit(bandaides, etc etc.)
ifak includes everything to deal with multiple gunshots. it has quick clot, multiple turniquits, chest seal, compression bandages, gauze, nasel airway tube, chest decompression needle and a few other items.
learning materials are readily available.