Software, Music, Movies. It is true that US law does not extend beyond it borders but lets say that I like the design of your house. One puts elevations and a few pictures of in progress work in a public forum. Keep in mind that you paid and personally worked with the architect and put your own "touches" on the work, and are also going to be selling this house. Under the present theme it would be just find to take that work and produce a replicas, and sell it. Someone else for their profit is now selling ones imagination and intellectual ideas. Is that ok?
There are far more serious acts being commited but as a root cause: Is it the basic line the it is ok to steal because it cost to much, cant get a real copy, the only have conterfit, or everyone else is doing it so why not, wait it ok because they are making piles of bling bling its ok.
For every design, program or operation they are people just like you that go to work, program, design or run. They have dogs, kids, people that depend on them, no matter how you stack justifications.