The premise is false. Musk doesn't need to ruin ground based telescopes in order to make Starlink a reality. This issue could be resolved by going slower, Musk just doesn't want to wait.
Musk drives his team for speed because every one of his companies still has the "how much runway do we have" mindset. Lots of people can throw stones from their glass towers knowing they work at a company that will exist in 2030 or 2040, but SpaceX can't say that unless they are always moving.