Free speech is....free and I personally value it deeply. So I am ok with the radicals. And as I said, they can be blocked.
I believe quality posts and information will outlast the haters and as I said it's possible to customize one's presence to an extend. Minds is seen as the top competitor to FB while Gab is the same for Twitter.
Here is my invitation to Minds: https://www.minds.com/register?referrer=innereric (they have a point system that allows one to boost posts and channels without spending $$. Could be very good for spreading messages)
Here is my channel on Gab: https://gab.ai/innereric
Here is MeWe: https://mewe.com/i/ericr