What did the US Capitol Police do wrong on Jan 6?

The only thing police did wrong in Jan 6 was to shoot and kill one J6er. Should have stacked up the bodies about six high all around the Capitol.

In other countries, when a coup fails, those who attempted the coup either:
1. Are executed, often on the spot.
2. Go to jail for a loooong time.
3. Are exiled to a foreign country, never to return home.

While I’m in favor of #1, 2 or 3 is fine.