Because equality politics demands respectability politics. Rather than tear down or smash or, even more kindly, transform the patriarchal institutions of marriage and the military, gays sought inclusion into them - the impulse of heteronormativity and the democratic ideal of equality too deeply conditioned into their mindset. The gay politics of respectability reasoned that formal inclusion in the nation's institutions was tantamount to, or at least would induce, societal acceptance. (To wit, the gay defense of marriage proffers nonsensical arguments that marriage is necessary because the marriage contract prevents their kids from being bullied at school for having two mothers.)
Traditional Jewish weddings share key aspects with Christian weddings, historically seen as property transfers, where a woman shifts responsibility from father to husband.
In the US, nationwide marriage equality was achieved on 26 June 2015 after the landmark Supreme Court ruling in the case of Obergefell v. Hodges legalised gay marriage in all 50 states.
At the peak of Pride month, has 'Love is love' been replaced with 'Don't save for a hat'? We see fewer queer individuals marrying compared to straight couples.