But, also, There are many people that [do not] believe OOA because they [do not] want to believe it.
That's why we look at genetic evidence, to eliminate nonsense. That evidence strongly points to chimps, gorillas, humans etc all coming from the same place.
If it makes you feels better, think of it this way:
we don't believe OOA because the evidence says we're related to blacks. We believe it because the evidence says we're pretty much hairless apes. (And a lot of us aren't even hairless!)
There, feel better about it now?