Because (1) it's more fun discussing conclusions than assumptions and (2) it doesn't matter. Reddit mostly seeks to be entertaining. It turns out that improv/L

Because (1) it's more fun discussing conclusions than assumptions and (2) it doesn't matter. Reddit mostly seeks to be entertaining. It turns out that improv/LARPing is more fun than reading or writing the 100th comment of the day that just questions an OP. We can't know if OP is being truthful or not, so why not just assume it's true and play along. HN is different and some subreddits focus on being educational. But most are just trying to keep engagement up and don't mind the fakery/scenario-building/theatrics, as long as it's on-topic.