[oddity]

There are different forms of argumentation and they have a different tone that maybe doesn't come through so well on the internet without context. I dislike the debate club mentality where arguments are more like a spectator sport than a deliberation most of all, but there are less combatative forms of arguments that are really more like questions with extra scaffolding. I think all people are weakly informed and weakly opinionated about a different subset of most things and it's not always clear when you are in an environment with people who aren't also weakly informed and weakly opinionated. Arguments of the form "I believe this" and "here are my (maybe not so great) reasons" can be a reasonable starting point for laying out your prior knowledge and biases. Making it clear that it is only a weakly held belief is an art form, though, and I can understand why someone might omit that step in an (assumed to be) hostile environment. It's one of the reasons why I think the choice of forum matters. It can be easier to be more open about what you don't know if you aren't subconsciously worried about being attacked for it.

As you said, (I'm paraphrasing) there are often better ways to go about things.