Hiding one's actions out of concern for offending others

I was recently on an airplane reading Why I Am Not a Christian and Other Essays on Religion, by Bertrand Russell. I was concerned about how other passengers might feel if they saw me reading a book with such a title. So I tried to make sure no one could see exactly what I was reading. Is there a single word or short phrase that describes my hiding something out of concern for offending others? I haven't been able to come up with a word or short phrase that really works.

discreet
adjective
careful not to cause embarrassment or attract too much attention, especially by keeping something secret:
The family made discreet enquiries about his background.
They are very good assistants, very discreet - they wouldn't go talking to the press.
-Cambridge Dictionary

I would suggest a phrase solicitous discretion

solicitous: characterized by or showing interest or concern:

she was always solicitous about the welfare of her students

a solicitous inquiry

discretion: the quality of behaving or speaking in such a way as to avoid causing offense or revealing private information:

she knew she could rely on his discretion

Oxford Dictionaries Online

I like discretion (which is perfectly accurate), but given your location where sensitivities can run higher than most I'd offer

Situational awareness.