An incoherent argument for spying

The Timaru Herald gets this one pretty wrong.

Peter O'Neill's editorial there makes the following case:

• Yahoo!, a private company, saw that one of its service's users was trafficking in child pornography.
• Yahoo! alerted the American authorities, who got in touch with Internal Affairs in New Zealand, as the user was in New Zealand.
• The Americans then asked Yahoo for a few more details to allow the Kiwis to find the guy.
• The police here arrested him in Timaru.

That's all fine. Then the punchline:

• Therefore opposition to TICS, the NZ legislation making it easier for the GCSB to spy on internet users, is great and all the civil libertarians were wrong.

I just don't see how the last part follows from the first. All of the first chunk could have happened with or without TICS.