There is no need to distinguish between a selfish and a careless mindset for Willoughby because he is both. He is selfish to exploit women for his pleasure and he is careless of the affect his actions will have on their future. I think the comparison is careless versus malicious. I do not believe maliciousness is a necessary component of predatory behavior although it certainly could be as you suggest. Willoughby’s behavior is predatory as in “given to exploiting or destroying others for one's own gain” (dictionary.com) and at the very least Willoughby’s motives with all three ladies (Eliza, Miss Grey, & Marianne) was to exploit them for his benefit. The fact Willoughby may be careless of the consequences of his actions to the women he exploits instead of malicious is only a slightly less reprehensible blight on his character. They are all horrid! (:D)