I'm with Ani on this whole analogy thing. Further, it's not really about what the ISP expects you do with that bandwidth. They give it to you because it sells as a service much the same way sports cars sell as a car. It's legal for them to sell it. It's legal for you to buy it. It's illegal for you to speed with it.
And there ARE ways to download movies legally. Most just don't choose to.
PS: were these all using public trackers right?