The medium selects those who are both loudest and have an adequate factual basis. Peppering statements with "In my limited experience," makes you seem meek, unfortunately. Blame the culture of needing traffic and thriving on controversy. It feels like it is a race to the bottom. :(
Having said all that, it does seem hard to find intellectual honesty on the internet, but I had more trouble finding a decent newspaper in London so it's not an isolated problem.
But students tend to interpret that as weak and muddled, and prefer profs who "tell it like it is", even if that means in a fairly biased and opinionated way. It seems they particularly like it when you make black-and-white statements that would be controversial, roughly equivalent to "there's a debate on this but you don't need to know about the other viewpoint because it's wrong".
It is the same reason why there was conflict in the Robber's Cave experiment between the two groups. As a species we group together with people we mentally associate with and have a natural prejudice against any external force.