Well, .... yes, i do come off as very sure of things that i write... because they are the things i am sure about. We, on this platform, do not get to the place where i would be talking about theory and conjecture.
I guess i could talk about the shape of the earth. All i know is that we aren't on a ball of dirt.
Most of the stuff i write about is stuff that i see happening.
So, to me, it's like saying, "there is a tree over there".
BTW, i did not mention anything that the aliens would do, all the stuff i typed was about what happens to humanity when it is answered, "Are there aliens?"
Such as, Christianity takes a big hit when aliens show up. So much of the Bible has to be thrown out, or reinterpreted. The dogma that is Christianity will take the biggest hit.