Well, you are not questioning someone's mental capacity to do a job correctly. You are implying with no scientific evidence that transgender people are mentally ill, and stating they should be denied the right to choose there own profession. Prove being a trans is a mental illness. Otherwise, present each person you have a problem with mental health evaluation, and point out which parts of it should bar them from their chosen profession. Do those things, and you won't be a bigot.
There is a Trans person on this board, one who I often disagree with. Very often. But that person is not mentally ill, in my opinion. She is quite happy with the change, and if my kid should encounter her wouldn't bother me one bit. It's not like it rubs off, or trans people are trying to convince others its just a fun thing to do. And if my kid one day comes to me and says, I don't feel like a girl, I'm uncomfortable in my own body. It wouldn't bother me for them to make changes that makes them happy.
And proclaiming they are denying basic biology is just ignorance. It's not social conditioning that makes them feel uncomfortable in their own bodies, its biology. Why should they suffer because their chromosomes didn't form right?
And what about personal freedoms huh, who are you to decide what other people should be doing. In my opinion, its no ones business but the theirs.
What you are afraid of with Trans teachers, is it may show a student with similar problems that there is a solution. Instead of forcing them to shamefully hide who they are to appease the sensibilities of their peers.
As far as your point on suicide. Show me where these people left notes saying they did it because of the operation, and not say oh, the multitude of bigots such as yourself that bully them for daring to be different. More often than not suicide comes about from feeling ostracized. Not regret over personal choices.
Get a clue dude, you're part of the problem.