I have learned ages ago that US courtrooms is not about justice but about who can afford better lawyers. How else do you explain the same claims in US to not work in EU?
That said, I still believe Samsung loooooves to copy, but they try to make it close enough not to confuse but to give people the ability to have close to the same experience.
Apple does not do much innovating themselves. They merely take what others develop and put their spin on it. Of course some would claim they "perfect" it (a term used very loosely here) but they rarely come up with something truly unique (but I'm sure the fans will eagerly correct me here