Let me clarify; if someone tells me that he thinks there are flying mushrooms on mars, and i say “i have zero reason to think so”, and he answers, “yes, but what if? What will you do if we find the flying mushrooms?”
From the Torah perspective, there’s no reason at all to think that there is intelligent life on other planets. Hashem can and does what He wants, but whenever someone says “well what will you do if and when we find them?” Alecha lehavi raya – it’s on them to bring a stitch of evidence, be it logic or scientific – and there’s none. The only argument that’s made is that if we’re here, then whatever happened to make us probably happened elsewhere, since it’s just an accidental occurrence after all.