Antonia, even if the people don't belong in your own family tree, your research may be valid and maybe someday someone will come along and find your research and thank you for it.
When I started with genealogy many years ago, I had the wrong birth year on one of my great-grandmothers, and researched a large branch which I eventually discovered didn't belong where I thought it would. But hey, most of them were cousins of my own ancestors. So I decided to keep them, and that was the start of my wall-to-wall One Place Study.