It's statistically almost a certainty that there is life elsewhere in the universe. Intelligent life is pretty probable too. However, because of the vast distances involved, making contact with any life outside our solar system seems pretty unlikely; and finding any life more complex than single cells inside our solar system equally so.
In a dark forest, you have no way to identify if anyone you meet is peaceful or not.
So the only rational way (if you want to survive) is to hide yourself - and to kill any other before they might see and kill you.
So I'm not so sure if I want to find out if there is extraterrestrial life ...
It's interesting - I don't see the causative relationship.
To me, it would make just as much sense (ie none whatsoever) to say "I voted 'Yes' because I'm sure there is".
The question is "Do you *want* to know", and the answer is not reliant upon what (if anything) you already know.
The question is about what you *want* to know, irrespective of anything that you already know.