No one is forcing us to follow these figures on Twitter or vote for their party. Let the party members say what they like within the law. Debunk if it need be, and let adults decide for themselves what the truth is. If authoritarians try to stop us hearing from a political party, they remove our agency. And we don’t like that. Ever heard of the Streisand Effect?
Paradox of tolerance: https://en.wikipedia.org/wiki/Paradox_of_tolerance
The one thing a tolerant society can NOT tolerate is intolerance itself. If allowed to set root, intolerance will take over and destroy the tolerant society. The intolerant will be loud and aggressive, working to silence everyone else. Eventually, it's over.
Just like the fact that people who want to live self-determining lives in a self-governing democracy must be always better armed and prepared than the bullies and autocrats who want to freely plunder and run other lives & societies. If they are not better armed & prepared (either personally or by proxy of police, military, etc.), then the bullies & autocrats will inevitably take over by force at any opportune time.
(See also in economics: The bad money drives out the good, every time.)