There's a Gary Larson cartoon that shows a man in Hell being prodded by a grinning devil with a trident to choose one of two doors. On one door is written "Damned if you do," on the other, "Damned if you don't."
That's how it is with using qualifiers such as "I think" or "in my opinion." If you use them, you're weakening your argument. If you don't use them, you are presenting what you're saying as though it is a fact (which it might be), but inevitably, you'd better believe you're going to get a request for "sources."
I like to qualify my comments. It doesn't mean that I feel less strongly about them, but that in this vast universe of information there just might be
something out there to refute what I see as irrefutable. Sometimes the only thing we can be sure of is how we feel about what is going on, especially in light of the fact that our sources may just as easily be dismissed by the person(s) requesting them.
While we are blessed with professionals and students in many diverse fields on this board, we also have people (like me) with a lot of life experience and some higher education, but mostly with a general interest in the subjects and a desire to make our opinions known.
Without such a mix, could this forum be as popular or effective? A computer can come up with unlimited raw data and tedious bibliographies, but it takes humans to interpret it into something thought-provoking and at times entertaining.