Full Q:
and wouldn't dust not trust corelfrisk, because even though despite how nice they are, they're still the human technically?A:
Core!frisk is definitely good person. If he observes their behavior, he'll see it soon. It doesn't matter that they have the appearance of the human. (Honestly speaking, they don't look like Frisk...they looked exactly the same as Frisk, he would never have believed them.) Aside from believing in them, he thinks that he doesn't deserve to be happy. He can take their suggestion and send others (without the human) to Omega Timeline, but he will never follow them there.
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Canon Murder!Sans / Dust!Sans Facts
General FictionAll of this information was taken from the "Ask-DustTale" tumbler page → https://ask-dusttale.tumblr.com (Also the page is open to questions and is still answering. But I think you should read a bit to make sure you're not asking the same question...