Umm... It's now limewire's fault you got that virus. Even if you don't download .exe, vbs, etc. files, it's still your fault. .Zip files can contain all of those types of files.
Oh and about the kiddy porn? That's not limewires's fault either. They cannot be held liable. The reason: In order for them to be able to effectively block, delete it, and ban the ip addresses, they would have to spend hundreds of thousands of dollars on photo recognition software that would take precious gigabytes of hard drive space, take months to download, and also, software like that has not been invented yet. They could just filter out the file names, but that wouldn't work. Some do not even have regular file names so people get tricked often. I once downloaded a zip file that supposedly had a song in it. It instead had some really sick kiddy porn.... I hope those people burn. MWA HA HA HA HAAA!!!!! Also, if you find kiddy porn while browsing a host or searching (hopefully not for that), then I encourage you to report those IP adresses to the proper Authorities.