Excellent thinking, unassailable logic. I'd go a step further to state we truly are incapable of "understanding" nothingness, we're not constructed to know (in any sense) what that state is like. Precisely the reason we can't truly anticipate death, it's completely foreign to our sensibilities.

Humans evince resistance to an obvious reality, we can't know what is unknowable, that is to say, that which we are incapable of experiencing. I can't know what another person experiences let alone some living entity built according to some alternate template.

Logic dictates a conclusion that other life likely exists in the universe. Also the odds favor that we can't know what it is given the intrinsic limits to what humans are capable of knowing.