Since when is a shut-in an act of terrorism? As far as I'm aware these protesters at the Capitol didn't kill or attempt to kill anyone. Yes, they damaged government property. Many will face prosecution for this.
Supporters of BLM have committed far worse acts in recent years but they are not labelled as terrorists. The only people that died at this event were the protestors - one at least was unarmed and murdered by a police officer. The whole thing is on video.