The staff in Dublin aren't any better, but the consequences are: you're not on US soil, so you can't be detained or deported.

Sure, I got that. I more mean, does it really stop them from being assholes once you land? On paper perhaps, but in practice, I wouldn't bank on it.

The whole point of preclearance is that there is no border control on arrival into the US, you exit the airport like you were coming off a domestic flight.