For me I think it has to do with the fact that by the time I got to a thread on reddit, everything that could possibly be said about the topic usually had been said already. How many times would you visit a thread only to find that exactly what you were going to say is already the top comment?
I don’t know, I think that trend analysis ignores the masses of ignorant poor people who think that Trump & the GOP are going to save them from whatever boogeyman the GOP has constructed for them today.