Cimorene

I haven't seen the series, but even book!Crowley is pretty firmly in Heaven's bad books; I mean, he was the snake in the Garden! Arguably ever sin after that one is his fault. And he goes about making people miserable in job lots. Makes Hastur's "spend ten years corrupting one person" schtick look like small potatoes, really.

And yes, Aziraphale when it came down to the wire was willing to commit murder in the name of a Greater Good - not the Greater Good endorsed by his superiors, i.e. the end of the world, but no different in (heh) valuing the end above the means. The whole point is that they're both less pure [good/evil] than they think they are! An "X did nothing wrong" attitude practically misses the whole point of the characters AND the narrative.

though as Death would point out, they were just beating the rush.

Snerk! And this reminds me of Crowley sacrificing his beloved Bentley in the name of averting the apocalypse, which is also appropriate to the whole "nobody is a sweet harmless fluffbunny and nobody is an irredeemable villainous blackguard" message, too.