In most cases, and in the vast majority of people, "reasoning" functions as follows.
Yes it often works that way, though I do think that most humans are capable of much better, and a lot of the blame lies with our education systems, who don't teach the alternatives. In fact, in the classroom any 'P' who shouts loudly enough, usually gets praise for being decisive and articulate.
But that is just an intuitive thought on my part.