I think it's similar to the reasoning for "We aren't going to trigger the Yellowstone Supervolcano with the Tesla Model 3" and "We aren't going to trigger the Yellowstone Supervolcano with new vegan egg replacements" — we just don't have any good reason to believe it will happen.
Because "Why not?" is not a reason to believe something. Cars also cause the ground to shake. So do sledgehammers. Not everything that sometimes causes the ground to shake will cause the Yellowstone Caldera to erupt.
Fracking is associated with relatively small earthquakes. But relatively small earthquakes happen in the area of Yellowstone all the time, so that doesn't necessarily seem alarming.
The thing is, this isn't, as you requested, "reasoning suggesting that we aren't going to trigger the Yellowstone Supervolcano with fraking". But it's also not "just being sarcastic". What I'm pointing out is that we have no logical reason to believe we are going to make Yellowstone explode with fracking. Until there is evidence that something will cause Yellowstone to erupt, it's kind of weird to be asked to argue positively that it won't.
Just curious.