How many individual developers has Apple picked on for patent infringement? None that I can think of.
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.