>>1You're only taking the recent lawsuit into play?
Keep in mind Apple's been rather busy lately with the lawsuits, even going as far as trying to sue a school in Canada over using an apple in it's school logo. Apple's philosophy is in proprietary closed source software, so they're one of the more lawsuit-paranoid companies.
That said, whether or not lawsuits are detrimental to innovation:
Personally I think so. If we claim that company A has a right to X, and company B has a right to Y, then nothing can really move forward without having those features missing.
(For anyone unaware, the *current* lawsuit of Apple v. Samsung is over a multitude of general features, such as the "slide to unlock" feature on smartphones that's become basic for some time now.)