How many patent trolls has Apple stepped in to defend their customers from? Lodsys backed off from attacking App Store developers when Apple said they'd sign on as a co-defendant in any case.
How many patent trolls has Nathan Myhrvold created through Intellectual Ventures? Literally thousands.
Apple's embroiled in a patent war. Don't confuse that with being patent trolls.
You also forget that Xerox remained uninterested in producing a consumer computer incorporating the concepts they pioneered. Likewise, HP, when Steve Wozniak was working there, declined to produce a personal computer he designed.