We humans - all of us - have always had a hard time remembering that knowing things - as opposed to the ease of believing things - is damn hard. Knowing we've found alien life will be a hard-fought, prolonged, exhaustive process of research, argument, and repetition, seasoned, because it's a human process, with every possible human failing.
Knowing things is like climbing Everest, a daunting, compelling challenge . . . with an amazing view at the end.