I like Grant's proposed answer to the issue of the Great Filter. It does make sense. There are multiple reasons why we can't find anybody else out there. I previously discussed these in a short paper on the Great Filter back in 2020.

The other day I was listening to Michio Kaku (#1828 Joe Rogan Experience) discuss the three levels of civilization and how, even as advanced technologically as humans are, we are not yet a Type I civilization. Even after millions of years of evolution. We are getting close, but likely won't get to a Type I until 2100 or thereabouts.

Could there be other space faring civilizations out there? Of course there can. It's a simple fact of numbers. The statistical probability is well over 99.9999999% that there are other space faring species just in our own galaxy. Add in all the other galaxies and the probability is indistinguishable from 100%.

Sure - humans could be unique in the galaxy. Unlikely, but possible.

As Grant notes, and as I noted in my earlier article, all 4 components of his 3. Mutually Assured Destruction filter are facing humans now.

The race is on - do humans win, or do we end our civilization and start over (if we survive at all)?

https://medium.com/@professorjamesphelps/on-the-verge-of-the-great-filter-ac8342700131