Fantastic question Liz! In fact I can! JK Rowling's postitions on transgender women and where we are or are not allowed (especially in reference to bathrooms) influence the positions of her fans and followers. By maintaining that trans women are
"delusional men" she spreads this belief. This gives people an excuse to misgender us ( T.W. which is a form of violence and pushes many of us to attempt suicide). By being so influential on others and platforming other prominent transphobic voices, Joanne has contributed to anti-trans sentiment. Anti trans sentimetn ALWAYS turns into anti-trans violence, even physical. JK has contributed to the culture which led to numbers like this : https://www.forbes.com/sites/jamiewareham/2021/11/11/375-transgender-people-murdered-in-2021-deadliest-year-since-records-began/?sh=5dbafe67321c
Not to say that JK Rowling went out and murdered hundreds of trans people this year, but her hands are certainly not clean.