You know, in most places that legalized it, homosexuality was not seen as something that should be legal by the majority of the population. If we operated the way you propose, homosexuality would have still been a crime, in my country, from 1961, until 2003. If most of the population supports fascism, or a genocide, or slavery, etc. does it mean we should just fall in line?
Homosexuality is still a crime in some countries and if your plan is to go there and fuck in public to prove some kind of point then I strongly advise not to.
If you thought I would suddenly have an enlightenment about how obscenity doesnt actually exist in any context, you would go get yourself executed? Thats very brave of you, I guess...?