Way back when I was on that other service, I had a pinned tweet for a time that concluded with something like the following line:

... when they're handing out "make your own internet policy at home" kits, they should some with a label saying "Adult supervision required."

In a post commemorating Ross Anderson on her blog, Heather Burns (@webdevlaw somewhere, I'm sure) quoted him regarding the same concern. However, compared to my snark, his phrasing is sublime, maybe even divine:

The idea that complex social problems are amenable to cheap technical solutions is the siren song of the software salesman and has lured many a gullible government department on to the rocks.

There is no "easy fix" for online toxicity. Anything that will be effective will be very difficult to put in place and will likely be the result of millions of hours of combined thought, analysis, experimentation and disputation on the part of thousands of experts in the fields being considered.