We've only seen what we've seen - we have no idea what kind of genetic information is floating around out there. Hell, as far as I'm aware, there has yet to even be an attempt to map the BP genome thus far.
That said, your rationalization is based on nothing more than supposition, and as such is about as valid as if you had openly stated "there probably isn't much we haven't discovered in space, so traveling there isn't worth it IMO", when we've yet to even scrape the surface of what's really out there