People can expect that life is common any amount they like (well, if they stay within the 1 in a few thousand planets upper bound we have as a fact nowadays).
My problem is with people insisting that's a certainty.
I'm pointing out that common belief was hilariously wrong in the past, so there's no reason to think it's not hilariously wrong now. The meme that "there's lots and lots of stars, so life must be out there" is not sound reasoning.
My problem is with people insisting that's a certainty.