And in terms of Amy's motivations, it makes no sense. Amy worked hard to create a lifestyle that didn't involve killing. She's not going to start doing it again just because she was forced to to save Jacob. And by the same token, if Jacob got sick again ten years later, I don't think she's going to say, "Well, it's been a long time since I killed anyone, so I guess I'll let him die." Time has nothing to do with her motivations.
In terms of Benny...well, I was thinking about how AtS/BtVS handled this very issue. Take a look at Holtz and Wood: The loved ones of people killed by vampires long ago are still shown to have legitimate grievances. Holtz literally came from the past (And time travel is a thing on SPN). Angel’s murder of Holtz’ family wasn't treated as any less serious because it occurred long ago.
Nikki Wood was also killed decades prior to Robin Wood's appearance on the show. While I do have some issues with how Robin’s story was handled, the writing did make Robin’s pain very real. He lost his mother. This isn’t something that disappears overnight. You simply cannot just dismiss it as, “Well, Spike killed her a long time ago." With Robin a character on the show, so clearly shaped by his loss, it would be impossible. We have the privilege of dismissing Benny’s murders as “a long time ago” because we know nothing about those people. Except that they took pleasure cruises, or worked for pleasure cruises.
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