Products don't exist in a vacuum. The things we build and the people who use them can interact with the wider world in unexpected ways.
I'm not sure Twitter is fixable; it's entire premise is the elimination of thoughtful discourse in favor of reflexive outburst. A 5 part tweet I read recently (around 1000 characters, a couple hundred words) ended with a lament regarding what effort was needed to explain his point. The virtue of brevity has been hijacked by the vice of half baked ideas.
The piece that struck me most was that, as users, we are incentivised to be outraged. How can we be incentivised not to? Or to share constructive views?