Why do gay activists get mad about polygamy?
Because it weakens their case that gay marriage is about love and that its about monogamy. The fact is that its really just a trojan horse for deligitimizing marriage as the institution from which children are raised.
Because it demonstrates that Gay Marriage leads us down a slippery slope.
Morality and all of its associated concepts are from the belief some higher power defines what is correct in human behavior. Today, "morals" are a religious pagan philosophy of esoteric hobgoblins. Transfiguration is a pantheon of fantasies as the medium of infinitization. Others get derision for having an unwavering Judaic belief in Yahweh or Yeshua, although their critics and enemies will evangelize insertion of phantasmagoric fetishisms into secular law.
Mosaic Law (of which the Ten Commandments is just a part) is the foundation of Western Civilization. Genesis is the primary focus of the Declaration of Independence, from where our Constitutional rights are derived. The Ten Commandments are the foundation of our judicial system.
Moses wrote Genesis. This is why such people will jump up and down screaming when the Ten Commandments are displayed or the Creationist idea of monogamy from the Book of Genesis is introduced.
The latter (Genesis) also ruins the illogical and non-biological arguments of homosexual monogamy. In a secular sense, homosexuality is an idolatry of perversion. It is in no way an anatomical function of the human organism, but a phantasmagoric creation from within the mentally disturbed human mind, a social psychosis, naked and on full exhibitionist display.
This is the whole crux of their attack on creationism - - they are really frustrated by Genesis, but cannot destroy the axiomatic state of procreant human biology, it does not fit their religious agenda.
Homosexual monogamy advocates seek ceremonious sanctification of their anatomical perversions and esoteric absolution for their guilt-ridden, impoverished egos.
Neither of those will satisfy their universal dissatisfaction with mortality or connect them to something eternal. With pantheons of fantasies as their medium of infinitization, they still have nothing in them of reality, any more than there is in the things that seem to stand before us in a dream.
Homosexual deviancy is really a pagan practice (and a self-induced social psychosis) at war with the Judaic culture over what is written in the book of Genesis (1:27, 2:18).
This is exactly what the National Socialists were at war with... so, when someone uses the term "Gaystapo," they might not realize how close to the truth they really are.
Many will seek ceremonious sanctification and esoteric absolution in some type of marriage rite, but that still fails to give them a connection to the eternal in both a religious and temporal, procreant sense - - the union does not produce offspring.
Dissatisfaction with inevitable mortality only feeds the impoverishment of the ego further. Homosexuals really hate human life; their whole desire is rooted in the destruction of it...