My take on it is Twitter just isn't, as a company, very good at making software. This is from external observation and a couple of reports from friends who used to work there.
My (probably unpopular) opinion is that they simply shouldn't have a voice. Twitter is bad for society period.
Though it doesn't help, of course, that TwitFaceTube are designed to maximize engagement at the expense of everything else, which encourages inflammatory content. Maybe if they didn't, we wouldn't have this problem.
And I don't think the power of short messages is specific to the United States
> Scandal and Betrayal: The Story of How Twitter Started