I'm going to disagree here and say we threw a spanner in his works through the luck of our being Azem - an Ancient, someone he loved, someone who
mattered amidst the rabble. I think we invoked some small semblance of the person he once was, and we saw a more vulnerable and human side of Emet than has likely been revealed for a while, but when we did not measure up, we became expendable just like all the rest. He was
capable of kindness, but the habit of attributing this to him as a defining personality trait after the flashbacks we see of him prior to ShB - and what we see once we disappoint him - seems too optimistic. Emet, deep down, knew the futility of what he was trying to do, he had lost the will go on, the years of isolation and disappointment wearing on him, and he wanted out, and it was more this that I think drove his inner turmoil - the desire to relinquish his duty but being so
tired, in every sense of the word - more than reasons to do with empathy towards mortals or his better nature.