In 2008 some people were against gay marriage without saying any of those things. At the time some arguments against gay marriage didn't involve being against gay people. One example would be the people who saw marriage and its attendant privileges as a reproductive subsidy. Yes, there are many reasonable ways to disagree that, but I'm not saying Eich was right - only that we don't have clear proof of any inner hatred. A nice, rational person can believe something that is realized to be untrue a decade later, that's just how science works. Even if you're 100% convinced that every argument in 2008 against gay marriage was false, that's still not sufficient to demonstrate that everyone who was against it was evil.