To put it frankly, there's a staggering amount of RP fallout from kidnapping a corpie and/or releasing them afterwards and not simply doing see corpie -> necksnap corpie.
I'd see more 'nuanced' methods of kidnapping really being used to target topsiders more than anything. Getting access to them is often difficult at the best of times, and moreso with recent corporate transportation changes in the game.
Some day down the road I think it'd be amazing to be able to do corporate espionage the likes of which we see in film and literature. You kidnap a corporate, pull their chip, download their keys, reinstall their chip and ransom them to cover your tracks, having taken a contract from rival corporations in the first place for the intel. Or using a kidnapping plot to ferry sensitive data or smuggle items out of a corporation. Things like this can involve many, many players beyond hiring that -one- solo who doesn't give a shit anymore and will just necksnap people anyplace in the dome, you know?
Murder is probably the most trite and least interesting option for driving RP, but since there's a significant amount of challenges for doing otherwise, it's what people spring for. And I think the biggest challenges are those of purely logistical issues. Seeing people narrating themselves getting beaten, killed or kidnapped on pubsic topside, while entertaining, isn't overall super great for gameplay, I'd argue. Let the hall and corpsec piece together the case and draw a narrative out of what happened after the fact, since people are prone to error and ambiguity often results in even more (often hilarious in it's own right) fallout.