[quote]I don't think that is completely true... You might be accused of negligence, perhaps, but not responsible of what happens with your network. [/quote]

Sorry but it is true at 85%...You are not responsible if you prove you have taken the normal amount of protection against those risk.
Usually people penetrate system of user which are not well aware of all security risk giving hackers more power to bring down network.
So in order to make those people understand such risks, such laws exist...