Prior to the Civil Rights Movement, the US was a highly segregated country mostly because of "cherry picked" examples from the deep south. Federal law exists in part to put the entire country on the same page with respect to basic liberties. Its not OK for me to have more freedom of speech in California than in Texas, so why should it be OK for an LGBT individual to have more basic human rights in one state than in another?
So far the court only decided that the federal laws banning same-sex marriage are violating the rights of the citizens. They did not decide that recognizing same-sex marriage is a basic human right though, and since the text of the Constitution is also mum on this question, it would require a separate court decision to have federal enforcement of such rights, if recognized.
However not having such decision is in no way comparable with limitations of freedom of expression instituted in Russia. It's one thing to complain that the federal government does not force states to recognize same-sex marriage, especially if it doesn't even have a legal basis to do so right now, and another thing is to prosecute people for opening support centers for gay youth or for debating the topic of sexual relationships and freedoms in public.