It's legitimate to protest against injustices and menaces to human rights even when millions of people accept those injustices and don't recognize those menaces.
How many companies whose products we all use on a daily basis are directly or indirectly involved in abhorrent practices? Probably a lot, to be honest.
I'm not disagreeing with you, btw. I'm just saying the depth of what you're saying is a bit much for most people, since it feels inescapable.
I'm not talking about arm's-length issues like the extent of Apple's responsibility for Foxconn-factory worker welfare and to what extent Foxconn's workers are better or worse off than they would have been without Apple—whatever the truth of the accusations, they are unaffected by whether your Macintosh runs Linux or MacOS.
I'm talking about proprietary software licensing turning your own computer into a weapon against you, and reserving the understanding and control of the world you live in (the birthright of every human being) for Apple's anointed priesthood of licensed developers, who retain their status purely at Apple's pleasure. This is the central issue solved by installing a free-software operating system like Linux.