No, it's not LW's fault. It doesn't control the content of the files that are shared, so it's all up to the users. And some of us are obviously not "playing by the rules".
Actually, you can experience the exact same thing with your web browser. Sometimes when you search for something (for example "Limewire"), you'll get all these scam sites. The reason for this is because they put in their home page all these little keywords in small size and in a color that usually cannot be seen very easily.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-