Honestly, they should have done exactly that. Flag their content and ban them. Then go to the capitol. And when some politician asks, "why was I banned?" Tell them honestly, your statements were determined to be extremist by the same algorithm that bans Al Qaeda and ISIS from posting. Then sit back and watch the real fireworks go off.
Just because they have a political title does not mean we have to respect anything that comes out of their mouth. Call a spade a spade and be done with them.