With 9 comments here already, I see the problem being blamed on:
- Freedom of speech
No surprise that they're all ACs.
I'm sure it would be very upsetting for the ACs if /. started tracking IPs, but I suspect that a disproportionate number of "Trolls" come from the same IPs.
The original intention of posting AC was to protect a user from reprisals who posted a comment that contained insider information pertinent to the subject, but would be embarrassing or even illegal to an employer, a government or other organizations. Now it more likely to shield trolls from being responsible for their comments, even in the vaguest of virtual sense, than it original intention.
Tracking IP's tell us nothing about an AC, but does allow law enforcement to backtrack to a location. It is entirely feasible for multiple /.ers to be behind the same NAT, and banishing an IP addy can be circumvented as easily as rebooting a cable or satellite MODEM. Tracking IP could easily have a chilling effect on a forum that long cherished a wild-west style of no-holds-barred free speech.
If being Trolled or Flamed leaves you intolerably butt-hurt, perhaps a safer-place may be more suitable to your sensitivities.