That is definitely not their point. Their point is, quite simply, “don’t punish us, bro”. They don’t give a rat’s ass about the law in general or what it means for other people, they just want to make sure they specifically can do what they please without repercussion.
I think they try to argue around the diffrence of sharing activly (=illegal) and downloading (=valid) with this argument it does not matter if you download one book or 1 million books