First off, it does matter if what Samsung copied from Apple was copied from Sony. In order to own intellectual property rights, you have to be the inventor or creator. Also, you do not get intellectual property rights by filing paperwork with a patent office. Intellectual property rights are created when the invention or work is created. You only need to file with a patent office to sue someone for infringement.
One could argue that intellectual property law is out of hand. Did you know that everything that you and I have copyrights to whatever we post in this thread, as it is all literature, assuming that it is all our original work? Likewise, if I take screen shots of the posts in this thread, not only have I infringed on your copyrights, but I have also infringed on the intellectual property of the owners of this website, since I reproduced the look and feel of the website in another medium. Similarly, If I visit one of your Facebook profiles, and decide that I want to post your picture on my blog in an article criticizing you because I just don't like you, I infringed on your copyright to your photography. In today's age of technology, you can see the potential for a crapload of frivolous lawsuits under our outdated intellectual property laws, which is why Congress passed the Digital Media Copyright Act (DCMA) to provide convenient out-of-court remedies to keep these cases out of the courts.
Whether or not Samsung should be held liable if Apple suffered no actual damage is debatable. In many civil cases, nominal damages are available, which are damages that awarded just because the losing party committed the illegal act, regardless of whether or not actual damage (a.k.a. compensatory damages) was established. There are also punitive damages, which are intended to punish the losing party for their wrongdoing. Punitive damages are not usually awarded in breach of contract or intellectual property cases, but are awarded in intentional tort cases, such as battery, assault, etc.
There are established limits are to what can be copyrighted or patented. For example, I can't sue you for copyright infringement because you started your book with "Once upon a time", and I also started my book with those words. Similarly, Apple shouldn't be able to sue Samsung because their phone had rounded edges like the iPhone does. If that is the case, then Apple can be sued by plenty of other tech manufacturers. Should Samsung now sue Apple for making the iPhone 5 have a 4-inch rectangular display? Imagine if the inventor of the telephone sued the first cell phone maker for infringing on their patent because it makes phone calls, and has a 12-key dial pad!
Apple knew good and well that what Samsung did is common trade practice, and that Apple is also guilty of infringement under their own standards. Their intent to engage in anti-competitive conduct by filing strategic frivolous lawsuits is clear. Apple doesn't care if they win or lose these lawsuits; in fact, they are losing, or are having their cases dismissed, more than they are winning. Their actual goal is to bog their opponents down with wasted time and legal fees until they give up. They're also in it for the press, hoping to make Google and their Android OEM partners copycats in the opinion of the consumers. Yes, it is natural to want to defeat your competitors, but you do that by putting out betting products than they do, by having better customer service than they do, and by selling at a lower price than they do. Our legal system is not as a tool to be used for defeating your competitors!