The Cooper's hawk is known to falconers and rehabbers as fitting perfectly inside a (clean) Pringles can. ;)
I must correct you on hacking, though. This process starts with just-fledged raptors, already grown to full size, fully feathered, but raised in closed quarters. They are put in a shelter surrounded by plenty of space for flying where they can see the outdoors, and they are fed daily for a few days to acclimate. Then the shelter is opened and they're allowed to explore. Food continues to be provided daily. The day that one of the birds doesn't come back for its daily feeding indicates it has caught something on its own, and is ready to be recaptured and trained as a falconry bird.
This process allows the birds to learn flying and hunting as if they were wild raptors. It reduces certain negative behaviors you get in human-imprinted birds, and gives them "street smarts" i.e. recognizing and avoiding other predators. These days of course we put telemetry tags on them so they're easy to locate and recover.
As metaphor it would be training to deal with the wide wild world, which HN has a bit of too.