They think about things with themselves, their reasoning is internalized.
I am damn god at anticipating what people think, in fact I am the master, but I am not omnipotent..
They think about things with themselves but not solely with themselves. Their reasoning is also affected by others, consciously or subconsciously. They just take fewer suggestions from extroverts!
Imagine you would see the world thru your eyes every day. And that would be all you got, seeing the world thru your eyes.
Who can you trust then ?
And per definition, introverts even do talk less than extroverts about their perceptions.
What the hell to do with them ?
I hate people who hush
Personally speaking, being an introvert means I spend a lot of time watching and listening to others. Therefore, arguably, I see the world through many more eyes than most.
How did she hurt you this time Ent?
Omnipotent or impotent?
Does the journey to that opinion/thought help to validate it/disprove it in your own eyes? Sounds like your need to validate stems from the lack of trust as opposed to the other way around. If you found the elusive trust then the introverts' lack of visible reasoning would no longer bother you. Therefore you could trust an introvert.
I suppose the wider question here is what does someone need from another person to begin to trust them?