Earlier quoted context omitted.
"To be fair - the only reason he's doing it is because it would cause a significant drop in sales for Apple devices." That's not being fair at all. To say the only reason he is doing it is to protect iPhone sales doesn't speak to Tim's character. Of course he cares about sales, but he also cares about privacy.
Normally people on HN are much more skeptical about airy promises and assertions from corporate executives. I don't see what behavior on Tim Cook's part has indicated he's more to be trusted than anyone else.
Compare to GE, which rolled over [2].
So I believe Mr Cook when he says his opposition to the FBI's request is rooted in a desire to do the right thing, and not the bottom line.
[1] http://www.macobserver.com/tmo/article/tim-cook-soundly-reje...
[2] http://www.nationalcenter.org/PR-GE_Climate_Change_022114.ht...