What a silly generalised statement. You might as well say downloading is naughty. P2P is a fully acceptable way of downloading large files,especially if you have a slow conection. As game demo's get bigger,P2P is handy if you get disconnected,as you can resume again where you left off.There is lots of legal software to share on the P2P networks and this is certainly not naughty,as you put it or illegal.
Don't be stupid. Downloading copy right material is illegal, however you download it.You certainly don't need P2P to do it,although their netwoks are full of it. P2P is just a tool that can be used for legal and illegal purposes.It's not P2P that is naughty,just the way some people use it. Driving a car whilst drunk,with no lisence or insurance is illegal.That doesn't mean every one that drives a car is naughty and shouldn't do it,or is doing so illegally. And please don't use sarcasm, which is bordering on slander.