Native Spanish speaker from Paraguay, here.
Perhaps part of the reason is that many "hacker-geeks" who speak Spanish natively and are highly vocal as to being able to form an online community, tend to have viewpoints which are even more radical to the left than those from the U.S. At least, that was my experience with barrapunto, which is/was something like the Spanish version of Slashdot. Too left-wing for my stomach, and they can also be extreme in their communication. Suffice it to say, I was doxxed there and my sin was to be more conservative than other users. After that, I left, never to return there. Why would I lose my time with such people?
In English language sites such as HN, most people try to be civil and their views, statistically speaking, are more moderate in my experience.