It's not inappropriate to be outraged. What's inappropriate is to post comments to Hacker News that vent aggression at other commenters and/or those on the other side of the conflict. Doing that is against both HN's rules and, more importantly, the intended spirit of this community (https://news.ycombinator.com/newsguidelines.html). A certain amount of processing or, if you like, metabolization needs to happen between those two steps.
As I say in many contexts, you may not owe the other side better, but you owe this community better if you're participating in it (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...).
Here's an analogy which may (or not) be helpful. Even in the middle of a war, it sometimes happens that enemies meet and discuss things. Such discussions won't help anything or anyone if they just consist of yelling at each other.
p.s. I appreciate your question and apologize that you had to reply here instead of to my comment itself (https://news.ycombinator.com/item?id=46221528). We have to turn off replies on pinned comments, but I hate giving the impression that we don't want to hear responses or objections.