That's because there is no argument to be had. Ads subsidize the vast majority of content on the internet, full stop. Just as they did TV stations before cable. That content wasn't free, those ad companies paid for their ad spots, which paid for those television shows. The same is true for the internet, without ads, the internet would look very, very different. Without ads, there would be no innovation, and a hell of a lot less content, 80% or more less. We're talking going back to the mid 1990s, and not in a good way.
So I guess if that's your ideal internet, sure, that's not an argument for ads. But for me, I prefer the current internet. I like my websites like reddit, facebook and youtube. I like having the news at my fingertips. I like being able to watch any TV show I want.
It's a butterfly effect on a massive scale - you remove ads from the equation, the majority of what we know as the internet goes with it because they're directly responsible for the bulk of the innovation.