It is my observation/conclusion that these 5 myths persist, because the myths stem almost exclusively from the minds of not only cis-people, but the power elite and various sorts of religious/conservative hate-mongers, who, a few generations ago, was (and perhaps still is) spewing (and supporting and legislating) basically the same rhetoric about (and against) black people.
im tempted to compare trans people and other non-binary and intersex people, however smaller we are in populous percentage, to being, as the era-lingo of the (pre-)civil rights times would call blacks, but i will leave that to someone else, however much the similar struggles and other social phenomena may cross-match.