Actually, reality being what it is smuggling continues because it's pretty much impossible to check everything carried by trucks, planes, boats, etc...
Geekdom has been targeted before and usually we laugh about it when a shipment of something we're interested in is hit. The whole thing vaguely reminds me of the old "GURPS Cyberpunk" schtick from a few years ago the shipments of which were raided by the FBI. I believe Wikipedia covers it pretty well in their section on the "Legion Of Doom" (hacker group that was big then).
Truthfully I doubt they seized it because of the title, but because someone told them there was something up with that shipment (accuratly or not). We'll probably never know the exact details or if they actually found anything in this paticular case.
As far as seizing "cartoon porn" if that's a referance to the whole "Puni Puni Poemy" thing that's kind of amusing since I'm not sure if you can even consider that porn except perhaps in the loosest definition. While a bit off color, it's a spin off of Excel Saga for fans of that anime (and honestly a fairly aquired taste in humor). I'm surprised that went as far as it did. I wasn't aware anyone actually went to jail for it.