1. Yes, well, as stated, the story of the fictional Sam using the chainsaw to hurt animals was only meant to invoke the consideration that we can re-imagine what the actual 'equipment/gear' in horror movies terrify us about (so don't read it too deeply)
2. As per Leatherface and Carrie not being clearly self-resentful, I can offer some more supportive claims; while they are both 'focused/relentless' in what they are doing and are either completely un-evaluative or evaluative in meaningful instances (e.g., Carrie empathizing with her mother's psychosis), they both represent the human mind being completely fragmented by ugliness. While Jason, Lizzie Borden (etc.) are also plagued by ugliness, Leatherface and Carrie seem especially plagued by 'freakish ugliness' (Leatherface is deformed spiritually, while Carrie is driven insane by cruelty). So self-loathing becomes very important in assessing the ostracism (at least) of both of them.
3. Finally, I'd like to point out how (very amusingly) Leatherface and Carrie are both antitheses of
James Bond. It's an odd coincidental truth that while James Bond (a resourceful fictional British secret agent, intelligence officer, and spy) is an 'ethical mercenary,' Leatherface and Carrie are both 'pure survivors.' Feel free to argue!