Expecting life on other planets can be justified that way. Expecting intelligent life can be weakly justified, it only happened once here and seems to involve a lot of fluke. Expecting UFOs can't rest on that argument alone - you'd need new physics to get from any A to any B at an interstellar level and even more new physics to pull right-angle turns at high mach numbers in an atmosphere.
You don't know that. Maybe there were super intelligent lizards before us. Lets not be ridiculous. We can't even know if it is a current situation because anthropomorphic ideas and agendas (or even timeframe) do not necessarily reflect other life forms - maybe fungi is already connected to other dimensions like in recent star track episodes ?
There is also thinking that merging pre-mitochondria with bacteria into more complex cell giving birth to complex multicelular life was singular event on this planet and so must be very rare, but its unpprovable really and even if true just lowers the odds.
> you'd need new physics to get from any A to any B at an interstellar level and even more new physics to pull right-angle turns at high mach numbers in an atmosphere.
Really ? Aliens having totally different understanding on universe and tech then us sounds amazing ? Just if you had a time machine and get back lousy couple centuries would make us look like aliens.
