Earlier quoted context omitted.
> surely surely his supporters don't subscribe to at least the latter view there? You must not have very many conservative friends on Facebook. "Russia didn't write the emails" has to be one of the most popular memes of the last 6 months.
How is that a "meme"? I don't know any conservatives but every single leftist I know thinks that russophobia is at absolutely deranged levels, as a vehicle for Clinton apologism. The idea that "Russia decided the election" is absurd, but repeated often enough, is starting to be taken as truth by those who find it palatable.
I don't think Putin seriously believes he can control US elections and probably recognizes this as a one-off lucky break.
The whole point for him is the PR value: having Trump claim elections are rigged is pure PR gold for Putin. Having Trump claim protesters are paid Democratic shills (rather than real people who don't like him) is Putin cover. He gets to point at those words and say "see, it's the same everywhere". It gives Putin supporters cover to believe his lies and it takes the wind out of the sails of Putin's detractors.
My guess is Putin's original plan was to take advantage of Trump claiming he lost due to election rigging but we'll probably never know.