A lot of folks aren't great with numeracy, so I think it's good to use examples to help people understand how much tax Apple didn't have to pay that they themselves would have had to pay if they earned as much as Apple did.
Yes, explaining 13bn in terms of how many Children's Hospitals or Special Needs Assistants or Tablets per school child is very helpful in understanding how much money were taking about, and has no political agenda whatsoever.
