Welcome to Kellyfarms, so you are. Used to be Kawaii, so we were, but now it's all Smelly Kelly.
To answer your question:
Graeme is a certified retard living in a small town in the Irish equivalent of Alabama. It's likely the local Garda knew of him already, and I mean, picture yourself in the situation. You're sitting at your desk, nothing's happened all day except for Mrs Doyle's cat's run off again, when all of a sudden a great, fat eejit, with a troll nose and some derpy eyes, barges in, flapping his arms and crying in that nasal voice of his about how some teenagers from New Zealand have been laughing at him over the internet.
Likely the Garda just wanted him to feck off as quickly as possible. I think it's doubtful that Graeme showed them his full CP stash (some pictures from the GardaPhone Saga got posted earlier in the thread. They aren't definitely CP - in fact, they're *probably* legal. Probably.), and while the Garda definitely could have (should have?) given him a harder time about it, again, you have to remember: this is Graeme Kelly, the great fat eejit with a troll nose and derp eyes, who smells like tuna fish and has a stained My Little Pony shirt on. You've probably had some drinks with his dad down at the local pub, and you've seen him with his Special Needs club down at the community pool. Now he's standing not two feet away from you, desperately trying to show you all the porn he's got on his phone, so that you'll go fly to New Zealand and arrest those damn teenagers.
What would you do...?
I really think the Garda dropped the ball on that one, so I do. People complain about American cops being crazy and overzealous, but sometimes that's what you gotta be like. However, I can't really second guess the Garda too hard here; with hindsight and the benefit of 161 pages of documented noncery, yeah, it was the wrong call, but if I were in their shoes, I'd have probably done the same thing. Like, honestly, I'd probably be more terrified about doing something unprofessional that his dad and social workers might learn about - like breaking down laughing right in his stupid face - and I'd need him gone ASAP, so me and my fellow Gardas could let all this built-up laughter out in peace and safety.