The point is, You can't control the results, they are dependent variables. Thus, they are wild and can result in anything. You can not say with absolute conviction that aliens must be real. There may be an extremely high probability, but the key word is probable, not definite.
There are many other life forms out there like us thinking the same way, "are we the only ones that have life on this planet?"
Any planet can have life on it even if it's bot like us it can be bacteria that lives on any other planet in the universe
@SA that's complex but explainable; everything is possible, negative and positive, but there's a balance between the two. Each outcome will take place, in our universe or another (paralell universe).