You’re ignoring half of my comment

Those asteroids you’re talking about are in the solar system, aka the galactic goldilocks zone I’m talking about.

And while yes, you’re going to fine building blocks of DNA in the inner portions of the galaxy but complex life isn’t going to develop there due to being hit by gamma ray bursts every few thousand years.

And as I said, the outer solar system doesn’t have enough materials to make a lot of large stars to produce much elements heavier than hydrogen. You get fewer rocky planets and an overabundance of red dwarfs. Red dwarfs are unstable, giving off a lot of solar flares and coronal mass ejections. And their habitable zones are so close that any planet in them would be tidally locked, which is bad for the development of life, because you’ll have one side that’s scorching hot and one side that’s freezing.

The problem is that so many people desperately want their to be life elsewhere in the universe that they’ll latch onto any feasible evidence they can find. It’s very hard to be unbiased like that.