The online arguments I get involved in are resolved often. Because I try to have them resolve. Plenty of times it's totally easy to resolve an argument. It can go like this: you spend some time thinking, realise that the person you're arguing with is correct, then you say "Oh, I see your point now. I didn't realise x which is what lead me to think y. Thanks for helping me realise this mistake and gain a better understanding of the issue."