vampire entrances to homes

quick question (one that’s bothered me for years): i remember rebekah telling elena the story about how the mikaelsons became vampires and she says “neighbors who once opened their homes to us could now keep us out” as one of the ways nature turned on them.

was there any lore given reason why nature decided that vampires needed to be invited into homes? if not, what are some headcanons you’ve come up with? i’m curious