> There are countless facts, indisputably so.

True, but isn’t the problem here that even though there are many facts, no one of us knows most of those facts with absolute certainty, and we learned them from other people, therefore we primarily hold opinions about facts as opposed to know them first hand.

My experience of gravity correlates with the explanation I was given in physics class, but I haven’t myself proven anything about it, and I just trust other people’s stories when they tell me gravity affects light or time.

I think about this often when contemplating arguments; there’s almost nothing I personally know first hand. Like you I believe in facts, but I recognize that I’m not the source of most facts, and I’m relaying a story someone else told me. I’m guessing this is one of the reasons facts can be so easily argued, because there are gaps between facts being established and facts being told and shared. Like, it’s pretty common for scientific research results to be oversimplified and told & shared in a way that doesn’t capture the entire truth, right?