There's no Kessler Syndrome where Starlink is.
You'd know this if you read Kessler's first paper. It's online.
i.e if every single Starlink satellite crashes into another you won't get Kessler Syndrome.
And the same it true for the planned Kuiper.
The spacecraft wasn't designed with humans in mind first.
And second:
This is a paper by Kessler himself:
https://conference.sdo.esoc.esa.int/proceedings/sdc9/paper/3...