These are related concepts since if violent blood could run through a persons veins, the person can be judged as more violent than they are.

> I sit here, armed with this knowledge, and I think to myself quite shamefully, You can take the man out of Syria but you can't take Syria out of the man.

Seems like author is punishing self for some relatives faults. There is absolutely no reason to feel shame in this case, in my mind.