They put an extremely unlikable candidate with a rotten record in his place and they know it so they're trying to deflect attention as much as possible from her and try to keep Trump on the defensive. The plan is to keep the attention on Trump's and Vance's perceived failings, whether imaginary or real, and away from Harris's.
With all the images of lefties with their actual weirdo associates popping up in recent days (I was vomiting for like two hours straight after seeing the George Takei link), It seems like the RNC has an easy ad:
Make a slideshow with each slide being a side by side of Vance or Trump doing stuff and one of Harris, et. al. doing stuff.
Vance having a BBQ / Kamala shaking hands with a bearded dude in a dress
Trump playing golf / lefty staffer naked and bent over in the senate chamber
Trump at WWE/ Scott Weiner at SanFran pride parade
The list goes on. If conservatives have the least bit of PR acumen, this whole ridiculous, "going to church, having picnics, going fishing are all weird" bullshit would fail pretty quickly. Even mainstream dems aren't into all the hundreds examples of lefty politician kink that are out there. They all have kids that they want to shield from that. All these "Vance is weird" statements I have seen in the MSM have all been statements. They never seem to show any photographic evidence of Vance "being weird". Because if you show a picture of a guy having a beer in front of a campfire and call him "weird", it kinda kills the propaganda.