[Retra]

I'm not sure why you think that's a prohibition on political content in examples. Lots of technical books have diatribes concerning many things irrelevant to the subject matter.

I read a programming book that dared to have jokes in it once. Gasp! One even talked about DNA and the wagging of dogs' tails. I suppose we've got to be extra puritanical and dogmatic once our delicate political sensitivities become more important than learning something. That way lies progress.

[brain5ide]

Jokes are what is called comic relief - a psychologic tool to ease the acceptance of the content. I find it hard to imagine a political topic fitting the same function. But who am I to judge the author o his choices of examples. The only way is through not buying the book and maybe giving advice not to buy it either.