Those aren't really motives.
The Shape had no motive. Sure, he was locked up. But that's not why he kills. It's the other way around. He was locked up BECAUSE he was a killer. He had no reason to target the people he did. He just saw Laurie when she came to the house, and took an interest. Because he was a psychopath (and much more, as we discover in the film's final moments). It wasn't until the sequels that they attempted to explain his motive and give him some kind of link to the people he stalks. I prefer the original approach.
And the "motive" you point out for Black Christmas is a bridge too far. It's the same lack of motive that you get in The Sleeper. The phone calls only hint at a possible motivation for the killings, giving cryptic clues to a mystery that is never uncovered. There is no real motive. The remake tried to unravel that mystery and spell out the motive and it failed pretty miserably.
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