We have asked, and been asked, before.
If you had illicit people cargo at a port, say Long Beach or Port of Los Angeles, what are the ways you could transport them without going on a road?
Helicopters is one possibility.
Also trains, tunnels, bicycle, etc.
Planefags know there are a LOT of private choppers who fly all over the extended LA metro and outlying areas and up and down the coast. We see them all the time.
Law enforcement uses choppers extensively too. Private choppers would be less noticeable among the frequent LE choppers.
There's also an ordinance in LA requiring new high-rise buildings over a certain height to include a chopper pad on the roof. Yep. It was supposedly for fire protection.
Anyway, I don't know anything particular about Kobe's use of a private helicopter.
Pic related: LA Modifies Fire Code Requirement for all Skyscrapers to be Topped with Helipad
Might this play a role in human trafficking?