The analogy is pointing out that homosexuality is not a taboo because it's been exploited, it's being exploited because it's a taboo.
Your original statement seemed to suggest that it is still a taboo because those who wish to exploit it want it that way. The cause is not power brokers, it's everyone (or enough of everyone) who makes taboos' shamefulness persist.
there will always be something taboo in society to blackmail people with.