Nikki, You're asking Megan, but really your question is phrased both unfairly and inflammatorily.
I believe we have to empathise with every other person, to understand their view, in order to then bring about greater mutual understanding.
Personally, if a person holds those transphobic views, that's up to them and their loss, but if that person is in a job where their decisions and recommendations affect the lives of transgender people, then clearly they are in the wrong job and the contract was rightly not renewed.
What Megan is saying, is that extremism on either side of the debate is unhelpful; she is not endorsing JKR's views.