To the degree there's a design behind "Obamagate" it's this: To reinforce the claim that Russian interference in 2016 was a hoax. So when there are reports of Russia interfering this fall Trump can dismiss them as a hoax. So Russia can successfully interfere in the 2020 election.
If I suggested to you, through a blowhorn loud enough that all your friends and family could hear, that you had paid prostitutes to pee on you you might be a little tiffed too. Even though you've probably never done that.
