Random question I'll throw out into the ether because I've been mulling it over for the last month or so: If you're 70% certain the UFOs were aliens, but know

Random question I'll throw out into the ether because I've been mulling it over for the last month or so: If you're 70% certain the UFOs were aliens, but know they won't "reveal themselves" or share any knowledge, or do anything useful for the next 10,000 years; should we care about them?