Sorry, but your comments are coming off to me as paranoid and slightly homophobic. I've yet to see any proof that Roberts has some "agenda" to push is "gay agenda" over the airwaves or secretly overthrow Lester. Careful how he presents himself? Roberts isn't some stereotypical flamboyant, Modern Family-like, Ru Paul's Drag Race-like gay person. He's a reporter doing his job.
Anderson Cooper never used his sexuality to push agendas because Cooper has no agenda to push. Roberts promoted himself as the first gay man to anchor a broadcast (big point there) evening newscast because he is and he took pride in that, so what? It's not like he won't shut the hell up about it. Lester is the first black man to anchor a broadcast evening newscast and Katie Couric was the first woman. Other people made a big deal out of it, even if they themselves did not.
I assure you, if Roberts starts acting "too gay" on TV, or viewers start complaining about it, he and NBC News will know and do something about it.
It's much ado about nothing. Get back to me when Kim Kardashian starts reporting or anchoring news!