Because we know this entire moral panic is based on vague transgressions. The attacks on JK Rowling is the most obvious that everyone should be aware of. The cancellation of Jihad Rehab is another great example. If you want more I can supply a long list.

because once you attempt to start to apply any label it becomes more and more vague. If I am a black man from South Africa who hates white people for perpetuating the Apartheid, am I welcome or am I a racist? If I am a man who's own father transitioned to being a woman and I no longer feel comfortable around trans-people because I lost my 'father figure', am I a transphobe or am I welcome? I understand these are deliberately obtuse examples. I bring them up because I never know where on the spectrum the line is drawn for these labels yet people will gladly declare somebody a 'nazi' because their dad watches Fox News. Even asking the question "when does somebody on the right go far enough to be considered a fascist?" often is met with the retort "defending nazis makes you a nazi".