Keep them on or they will radicalize more? That just sounds silly.
Let them radicalize. See how that works when they don't have a voice.
Vice in this article links to evidential sources while summarizing the findings. You should bother reading it and what it links to.
ALSO, and this is a bug fucking also, that's not how the burden of evidence for claims works! You just argued against falsifiability! OP is responsible for providing evidence for their own made up claim!
The burden of proof is always on the person making an assertion or proposition. When they do not provide proof of their claim, and another person calls it "full of shit", it is not valid to shift the burden of proof onto them to disprove the original claim.
And there's a great reason for this - the bullshit asymmetry principle: the amount of energy needed to refute bullshit is an order of magnitude bigger than to produce it.
Ok, except that you 1) just made this up from whole cloth and 2) have missed the point of deplatforming entirely. Deplatforming trashbags reduces their reach. It doesn't need to change their minds. The trashbag is one person. The gullible are many.
https://www.vice.com/en_us/article/bjbp9d/do-social-media-ba...
> I believe in shining a light on them. Let the truth fight for itself.
It's very convenient that you then handwave away the very reason why this is wishful thinking.