They weren't kicked off over "free speech." They did something that's not allowed, and that video is propaganda. Dumb propaganda, because it will easily be proven to be BS.
You are manifestly a liar, as usual. 60 people did something mildly wrong and now Democrats want to lie and punish 60,000 people who did absolutely nothing wrong much less illegal.
They misbehaved, were asked to stop, continued and they were removed.
Easy. Whether you like it or not, it was a completely legal action. On board of a plane people that misbehave cannot be tolerated, since they endanger the safety of everyone on the plane.