If Trumps daughter and appendage knew what was going on and going to happen - how come nothing was done to prevent it?

https://www.yahoo.com/news/capitol-cops-girlfriend-sends-icy-235624263.html
Girlfriend Of Capitol Officer Who Died Sends Icy Message To Jared Kushner And Ivanka Trump

The girlfriend of late U. S. Capitol Police officer Brian Sicknick has pointed the finger at Jared Kushner and Ivanka Trump for their part in the insurrection that led to her partner’s death.

Sandra Garza appeared Thursday on CNN following the third hearing of the House select committee investigating the Jan. 6, 2021, attack. Her boyfriend, Sicknick, was assaulted during the riot, collapsed after returning to his office that day and died about eight hours later. Medical officials said he suffered two strokes.

“I was actually more moved on the first hearing with a lot of the testimony that I heard,” Garza said, “because there was so many people that could have intervened and said, ‘You know what? I’m going to go to the media. I’m going to go to the press. I’m going to scream from the rooftops and try and stop this.’”

“They knew Trump intimately. They knew how dangerous he was. And nobody did anything to stop him.”
If Trumps daughter and appendage knew what was going on and going to happen - how come nothing was done to prevent it?
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