Yeah I definitely do that too. I've never really thought about why I use that language, but thinking about it, it feels like a short hand and slightly politer way of saying
> I think you're wrong
> Here's why I think you're wrong
> Please correct me if I've misunderstood something
1 me being polite and not calling you an idiot.
2 me hedging my bets in case I am the idiot.