Your moral arguments are both succinct and logical. While there is no universal definition of democracy, equality and freedom have always been associated as the founding principals of democratic systems.
In a democratic society freedom is secured by legitimized rights and liberties which are generally protected by a constitution. These principles are reflected in that all citizens are equal before the law. Democratic systems cannot and should not be used to take rights away from selective groups on the basis of discrimination, be it for moral or religious reasons.
Love is a democratic ideal. The inalienable right to love whomever you love, for whatever reason, is also a human right. Emotional and or mental control over others is domination and bullying. It is against human rights, against universal rights, and against the rights of US citizens to be told what to feel and for whom. The only sane argument is yes on love, no on hate. Free love from oppression and honor the dignity of love. After all, Love is still Love.