Do you have any proof that starlink satellites are worse than the tons of space debris that enter the atmosphere every day?

The satellites aren't worse. It is the rockets that are worse. On the way up they emit various things into the stratosphere, which is about the worst place you can emit stuff when it comes to affecting the atmosphere.

It has not been a major problem so far because in its entire history humanity has only launched around 35000 rockets that have reached the stratosphere. Ramp that rate up significantly and it comes something we serious need to worry about.

(That's not to say that space debris reentering the atmosphere isn't bad. It also unfortunately deposits various things in the upper atmosphere that we really do not want to put there).