"there is still no good explanation for why Earth would be the only place suitable for life forms similar to us" 1. There is still no good explanation _that we

"there is still no good explanation for why Earth would be the only place suitable for life forms similar to us" 1. There is still no good explanation _that we know of_. We don't even know if we are the only life forms in existence or not: none of the observations made so far support the latter, but do not disprove it either. So we can't prove or disprove _any_ hypothesis about extraterrestrial life. 2. "Suitable for life similar to us" and "suitable for life to spontaneously appear" are two very different things. And we still don't know enough about either.