If you're feeling angry at things you've heard before and reacting with things that have been said before, that is not curious conversation. That is ideological battle, in which people use hardened pre-existing points to bash each other's positions. We don't want that here—but please understand why: it's simply a question of preserving this site for its mandate.
Battle mode a.k.a. flamewar takes over threads completely if allowed to, and destroys the curious conversation that HN is supposed to exist for. Since we're trying to be a particular kind of website, we need a community which understands what the site is for and avoids using it for what it's not for.
Some accounts are not only using this particular thread for ideological battle, but are using HN primarily for ideological battle overall. That's the line at which we start banning accounts. If you're not familiar with how and why we draw the line at that standard, there's lots of past explanation at https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme....