In high crime neighborhoods like mine, any recipient who hopes to keep their delivery will need a target pad somewhere behind property fences. I imagine new "delivery pads" becoming a product with a large pattern on them, easily visible from flight altitude. They will attach to deck railings or the top of 4x4 posts. That flight altitude will need to be higher than usual (in nice parts of town) to reduce attacks. We already lack pizza delivery here in north Minneapolis because companies had their drivers attacked too many times.