I see what you mean, however, my belief is anchored not in expectations but in scientific probability (I thin so, believe so, hope so)
Probabilistically and scientifically speaking (more reasons like planets with water, cosmic molecules close to ARN and complex proteins etc) , it is more probable that in Universe is more life than just us.
So the problem goes like this:
Q1. Is it probable we are the only life in the Universe or not?
A1. Scientifically more probable we are not alone.
From this scientific probability then we have the next questions.
If we are not alone, then what are the chances that
Q2 - if any aliens exist, then what are the chances that more of them exist? Like everywhere where the conditions are good?
A2 - if more than us once, probable more than us many times.
Q3 - the aliens have developed before us and reached space travel? If we evolved in 13 billion years, what are the chances that they evolved in 12.999 billion years (or less) and reached intergalactic flight? (which could be 50-100 years from where we are now)
Q4 - they found us
I think the probability is still very high even if from Q1 to Q4 you add more ifs.
So… I think my belief is based on science, not in emotion.
Believing that aliens exist, they are more than one single species, some of them are more evolved than us and they visited us, I think it is a scientific approach to the subject of aliens.