This is a catchphrase, not a thing that's actually true.
No, giving idiots equal voice reduces their shame & public shaming is likely the highest mitigating pressure against idiocy.
It obviously isn't anywhere near as effective as we would like, but I can't think of any legal tactic that actually works better.
Sunlight allows us to look (and kills bacteria).
Unbanning accounts gives them a megaphone.
Totally different.
That's the case if they aren't a group. Propaganda bots, state sponosored propoganda (look at the Chinese officals on covid.. you'll need to see the archives for that.. they'll directly claim that covid is the fault of the US Navy), professional troll army, state sponsored stalking groups, and extremist groups have been running rampant and in the open on twitter. (They have also been on Hacker News, Reddit, and Facebook)
That makes so much sense as to why the OG nazis were only stopped once they ended their long standing stance of keeping their rhetoric on the undermensch hidden from the world