I regularly shop at a small local market. There is a 60ish year old man who comes in wearing a mini skirt on Sundays. He intentionally stands near children and makes everybody uncomfortable.
Last month, I came up to him and quietly said something to him. I told him I was an FBI agent and I've been monitoring his activities. He turned white as a sheet and began to tremble. He quickly left the store.
He has not been back since.
Indeed, but it's still important to use terms to refer to specifics. Just calling them 'mentally ill' is too broad. It's also not entirely accurate, as transgenderism isn't just a delusion over what sex they're supposed to be, it's an ideology. Otherwise they wouldn't be so adamant to call out the fact that they're not what they claim to be by literally waving flags signaling such. They also wouldn't be so evangelical.