> Clamping down is not notoriously effective.
"We find that the ban worked for Reddit. More accounts than expected discontinued using the site; those that stayed drastically decreased their hate speech usage-by at least 80%. Though many subreddits saw an influx of r/fatpeoplehate and r/C******n "migrants," those subreddits saw no significant changes in hate speech usage"[0].
I expect if Parler et. al. took similar stances against hate speech and open calls to violence, they would see similar results.
> Without a clear understanding of how a problem came to be, how can it be fixed?
You can't test a treatment without an intervention.
edit: fixed asterisks.