There are much evidences that gender dysphoria may be rooted in biology. Transgender people don't choose to be one, for the fun of being ostracized and higher suicide rate.

BLM: it is proven by various metrics (economic, medical statistics etc.) that the Black Americans are being left behind because of SYSTEMIC racism. A radical change is necessary to address that, and people who want status quo wants 1. to deny that it exists 2. to resist the movement.

The "reality" changes everyday. The "truth" is not constant, because we don't know everything. So "terrified" that you may be wrong just may mean that you are clinging to the old "truth" and unwilling to change.

(Btw? It costs you nothing to acknowledge someone that they exist as they are, whether you believe it or not. They want to be called she/her? Fine. You can still have your opinion and respect someone's existence - it's not either-or.)