Yes, I think this is exactly it. A reaction that may be reasonable in a personal, real-world context can become extremely problematic in a highly connected context.
It's both that, as an individual, you can be inundated with things that feel like you have a moral obligation to react. On the other side of the equation, if you say something stupid online, you can suddenly have thousands of people attacking you for it.
Every single action seems reasonable, or even necessary, to each individual person, but because everything is scaled up by all the connections, things immediately escalate.