Kraichgauer wrote:
No, murder normally isn't an autistic thing, but inappropriate emotional reactions can be.
Killers don't show remorse in general, but them not being horrified by their terrible actions (there are of course exceptions) is a product of their socio- or psychopathy. Not autism.
The monster could be classified as a non-human animal, a different species from man. Humans in general don't show very much emotional reactions or guilt when killing animals belonging to another species. Mostly it is not a crime to kill other animals, and the humans wanted to kill the monster too. The monster killed a handful of animals who were not of his own species and he was a vegetarian, therefore had a considerably lower count of deaths of other animals that he was responsible for than the average human does.
Do you think Victor is reacting more inappropriately (unrelated to autism)? He laments the murders but those feelings don't properly inform his actions and don't make him really want to prevent the murders (for example the monster warned Victor that he'd kill Elizabeth if Victor married her, but despite this terrible knowledge Victor went ahead and married her, therefore causing her death. He didn't want it any other way, even though he shows negative emotional reactions).
It was certainly irresponsible and thoughtless on Frankenstein's part, after the monster had warned him.