I’d say having these groups coordinate in a platform where government officials are able to gain easy access is better than banning them and forcing them to move to more secure methods of communication
It's not, because extremism spreads like herpes. Making these platforms more accessible to government officials also makes them more accessible to vulnerable, stupid people -- and there's 1000 of them for every 1 fed who wants to stop a terrorist attack.
Also, the people at the core of these groups are absolutely aware of secure communication. The Facebook page might say "Rally for Freedom, 2A welcome" but behind that curtain, human dogshit are brainstorming things like "how can we get counter protesters killed".
As dumb as most of the far-right is, very few are stupid enough to plan crimes and conspiracies on Facebook.