You can avoid the issue by fiat claim that the is no sentient life but human and its Cylon creation.
If the humans knew of other sentient forms,they would appeal to them for help rather than go searching for earth.
In TOS of course,the lifeforms were typically not advanced enough to be of help,and I suppose they could follow that thinking.
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May've been the losing side. I'm still not convinved it was the wrong one.
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