>>14852837
Not receiving obvious signals from alien technology doesn't mean much. If it's a planet with relatively simple life, it's going to be difficult or impossible for us to detect it right now, even if that life is plentiful.
If we assumed, for the sake of argument, that sure, earth has the only life in the universe, that would raise a bunch of other questions. Because as mentioned previously in this thread, earth occupies no particularly special place in the universe, and we haven't identified any reasons why life could arise here but nowhere else.