Well then why would the competitors use swipe to unlock in their products? There are many other ways to unlock a phone. A button. Swirl your finger around in a circle to unlock. Type in a passcode.
The reason they used it is because Apple thought of something really obvious, but effective. A gesture that couldn't unlock a phone accidentally when in your pocket, but which is easy and intuitive to do when you do want to unlock it.
The competitors knew that was patented. They used it anyway, because they couldn't think of anything just as effective. They hadn't thought of it before, even in its most simplistic form. So yes, I very much agree with Apple suing over that. It's not like there wasn't a different way to do it.
You might see it as something simple and natural. It's easy to say that with hindsight. Even so much as a swipe unlock had a lot of thought and time that goes into it, especially when you consider what the phone industry looked like before 2007.
It's funny that you mention it,but this is also what bugs me,you talk about "how much thought and time goes into it" but apple was/is the one that doesn't give a rats ass about the people that really spend time and effort to create "something so simple and natural"and stole the idea in the first place and then they patent it and sue everyone else in the process ..... really apple?i mean Really?if you want to use it use it but don't try to sell it like it was your idea to begin with.
If you wonder there was a company that launched a mobile phone called Neonode N1 and guess what it had slide to unlock long before apple and Steve Jobs patented the hell out of it.