Look at it this way, for example Movie A just came out in the cinemas.
A cam version appeared soon after, and was downloaded 100 thousand times, that's a loss of 100K ticket sales.
Fast forward a while later, Movie A is now available on DVD and Blu-Ray, a DVD rip appears as well and again was downloaded 100k times, that's a loss of DVD sales amounting to 100K copies.
P2P technicalities and numbers aside, put yourself in the film makers' shoes, you could've sold more, which is why it's time to claiming losses legally.
All that freedom of speech and internet as well as copyright bull shit was shoehorned to those who are unaware of what's actually going on.
In the end, we are all taking advantage of what is made available to us, and we are also being taken advantage or being exploited by those who saw the opportunity and decided to make full use of it.
Nothing comes free, even pirating is effort when it comes to staying below the radar or doing stealth yourself.