No, I have never downloaded anything illegally. I've never pirated video or audio in analog form either. I respect the rights of originators.
And yet, you neither credit Rudi Hurzlmeier for the creation of the image used in your avatar, nor do I think you asked for permission of the right holders to use it here.
As for this book and the issue of the images used: I can see that it's not very cool to take theses images from startrekhistory.com and use them without asking for their permission first, but if they at least name them as a source for those images – which they seem to have done – I don't see how they would be doing something illegal. It doesn't make them criminals, but it doesn't make them very nice people either, I guess.