I kind of assumed Vance was the safe pick to begin with. Almost everyone else on the list is arguably easier to attack. The only other options I really liked were Flynn and Ramaswamy, and both of them would probably be getting dragged harder than Vance is right now. Ramaswamy would get similar criticisms to Javier Milei and Flynn might actually start cutting off people's heads and putting them on spikes.
When the baseline insult is accusing republicans of being serial child rapists, "couch fucker" is a pretty significant improvement. If that's the best dirt anyone can find, that means he's probably pretty clean.
I'm a little shocked he's being attacked from the left for harmless masturbation techniques. His policy positions are wildly anti-progressive. If I wanted to attack him from the left, I'd start there.