Murder at any excuse is wrong.The idea of a trans character lying and tricking a straight person into sleeping with them is an issue for a very specific reason: that's a real-world stereotype with a long history, which has been used as a justification to abuse and even murder trans people in the past.
Though i wonder why it has become a stereotype, is it because of a self-generated reputation from trans people actually doing that? Or something from the movies like making fun of Asains by making a chang-chung comment which asian people don't actually ever say.