You’re correct, it could. We just haven’t found proof of it yet, and people are hesitant to make unfounded claims that would be such a paradigm shift to our understanding of the universe.

The chances are above zero, and that in itself is fascinating

Radiation, potentially missing the gravity well of mars and flying off into infinity, micro meteorites, electronic failures, need me to continue?

Imagine a plane ride that takes a year, but infinitely more dangerous. Once you arrive to your destination you find there are no return flights, and it is nothing like the tourism brochure pictured at all. That’s why we send robots.