There are issues with all of your points, but 3, 4, and 5 are especially bad.

3. Amazon and Barnes & Noble charge similar prices. Apple's flat 70% no matter the price is the simplest to understand.

4. Apple has been very upfront about improving worker conditions, more so than other companies in the industry.

5. False, see http://www.macrumors.com/2011/09/08/apple-institutes-new-cha...

I'm not saying that Apple is perfect or that they couldn't improve their policies, but those are some weak arguments.