Nothing in the public record indicates anything about the dreadful, lethal fire extinguisher, or what caused it to strike the head of the unfortunate Capitol police officer. Was it thrown will lethal intent? Was it dropped from an elevated position? Did someone just chuck it randomly at the police presence and it happened to hit Officer Sicknick because he was the unlucky victim? So far, nobody knows. If tossing the object was done either maliciously or with reckless negligence, the bastard who threw it should pay. That's why we have laws.
What we do know is that essentially none of those invading the government buildings was armed, hence any talk of "insurrection" or "taking over the government" is Leftist delusion. For most it was simply an adventure gone wild. Not as bad as looting stores or attacking cops in a faux protest of some police shooting, but bad enough.
Also, we do know that Our Beloved President was hoping for a loud, boisterous demonstration of support, comparable to the "PussyHat" demonstrations of 2017. At some point he may have been "delighted" that the demonstrators were being boisterous...just like the Democrats were delighted when that "Madonna" person said she had thoughts of burning down the White House in 2017. But Trump said NOTHING to incite violence or incursion onto federal property. And for those who don't like that, there are written transcripts of his remarks available at several places.
We Right-Wingers take satisfaction in watching Pelosi and the deranged Leftists occupy their valuable time for the next couple weeks on a pointless, futile, transparently phony attack on one of the best Presidents we've ever had. We will remember this in 2022...you better believe it.