"Humanity", as the Judge defines it

[Bungle Jerry]

What exactly do you think this quality called 'humanity' is, that the vampire with glasses has it but Angelus doesn't?

Everyone seems to presume that an ensouled Angel would fry under the Judge's touch. So it's easy to say that the soul is the 'humanity' in Angel. It makes sense then that an unensouled Angelus would lack humanity. But then so would every other vampire: the Judge seems to imply that the vampire with glasses must have 'humanity' because 'he reads', but educated or cultured vampires are no rare phenomenon: the Master's Order were constantly reading scripture, Angelus cried at the ballet, Darla loves classical music...

Additionally, if Drusilla and Spike 'reek of humanity', would they have been burnt by the Judge's touch? Drusilla isn't worried much in the shopping mall, standing next to the Judge.

 

[Vengeance]

I don't think they defined it very well. I think they just made it so Angelus didn't burn so that they'd know it was really Angelus and not Angel. Drusilla was completely crazy so I don't think anything she feels really counts. Spike on the other hand maybe but he wasn't there in the mall. The minion I guess just didn't enjoy killing enough or liked reading too much. Vampires are a blending of human and vampire so it's natural for them to retain some vestiges of humanity. So I guess if you look at it that way they should all burn. Maybe it's like Cedar Point, you must be THIS evil not to get burned.

/random 2c

 

[white avenger]

I think that the "humanity" that Spike and the clerk-ish guy "reeked of" was traits from their human life. Spike, despite being evil at that time, still possessed the very human feelings of love, devotion, and loyalty, as is illustrated by his love for and protection of Dru. I don't know about the vampire with the glasses, since we never got to know a whole lot about him, but maybe he still retained some of his own human traits and mannerisms. Angelus, however, was pure, absolute monster, with no feelings of love, compassion, loyalty, or sympathy, something that is apparently not very common among vampires. Even Dracula, as we learn in Season 8, supposedly the "King Of The Vampires," (Okay, that's more Hollywood hype than Buffyverse lore) the epitome of everything that a "real" vampire should aspire to, could show feelings of loyalty and even affection toward his former "Manservant," and could feel responsibility for his actions in setting up the circumstances that led to the "Wolves At The Gate" arc. Angelus showed no love, respect, or loyalty towards anyone, and only used those around him to serve his own purposes.