I haven't had packages stolen here, because if no one answers the doorbell, the delivery person will personally call you and ask if they can leave the packet with a neighbor.
Sometimes they call you before going on route and ask you if the delivery address is ok or if you would like it to be delivered to an alternate address (like your office/neighbour).
I think the problem is you have people who grow up in violence and only know violence. If we have a society that successfully educated people, kept people from falling through the cracks and provided them with opportunities, violence wouldn't be necessary. But for how many generations has our society failed people? How many generations have the failed, neglected people in our society grown up only knowing violence as something to be respected? Two? Three? Four generations? The question in my mind is whether even violence will deter people, which I am not certain of. But certainly prison doesn't deter anybody.
The only real answer, obviously, is education. But education is almost beyond repair at this time.
If you want a solution to the spiral of violence, http://www.svru.co.uk/ were hugely effective as an intervention carrot-and-stick approach.
Just because that was the most vocal faction doesn't mean they are the only faction, or even the majority.
The solution is not more violence. I suspect the problem is that the police have failed at the basic business of connecting crime to punishment, so they roam neighbourhoods looking for people they deem suspicious and dishing out punishment. So you get injustice and crime.
It's a basic competence issue.