Hmm, why turn down an offer of assistance from a military whose commander-in-chief wants to overturn the election? I can think of a few reasons...
There's also a fundamental democratic issue at stake: It's not by coincidence that the United States Capitol Police answers to the legislature and not to the executive -- indeed, this is seen around the world (e.g. Canada's Parliamentary Protective Service answers to the Speakers of the House and Senate) and arguably the principle that military forces should not be brought to the seat of legislative power dates back to the Roman Republic... which swiftly became the Roman Empire after Caesar crossed the Rubicon with an army at his back.
Let's do a thought experiment: let's say there are a few elements in the police who are active QAnon believers, sprinkled in at various levels. Let's also assume some more force members are not believers, per se, but sympathize with the cause, and are willing to look aside since they may dislike some legislators who they see as enabling BLM, Antifa and other un-American actors (in their eyes) and believe that something "weird" happened with the elections and/or the whole establishment is dirty. Would these individuals not listen to the orders of the commander in chief, even when not delivered via the official chain of command?
It's a matter of law that they answer to the legislature, this isn't an "assumption." Individually they have answered to a not very sharp police chief, and the Sergeants-At-Arms of the House and Senate, who are all in the process of resigning because of how badly they recently screwed up, if that's what you mean.
I could have expressed myself better there - I was distinguishing between them being answerable to the legislature (de jure) in the logical, org chat way, and them "answering" to a mercurial president they ideologically agree with (de facto), in the here and now.
The footage of police opening barriers and stuff, and taking selfies is however a bit more worrying. I think it's pretty well known that individuals within the police could identify or sympathise with Q or the far right - so if it turns out that this footage was exactly what it's seems to be (and we know how easily things can be misrepresented and shown out of context) then I imagine some cops are gonna be in big trouble.
I don't know what kinds of contingency planning may have taken place, but ultimately this event seems to have been ended and cleaned up pretty quickly compared to some other demonstrations we've seen recently.
This is worrying in its own terms. Policemen are adult, and shouldn't believe in fairy tales.
Being able to use deductive reasoning, understand basic principles of science (like the difference between cheratine and DNA), double-check the facts, and find the truth between the lies is THE work of the police.
Somebody unable to see a hole for years in theories that most 5 Yo curious children could dismantle in a hour is unfit for this kind of work. They simply shouldn't be policemen. Period. Will end distroying the lifes of innocent people.
There is not enough information to come to either conclusion, but I would like to think the DC police leadership didn't/doesn't plumb those depths of incompetence. The public (and congress) deserves answers on what happened and why.
Unless something more sinister emerges the simplest explanation is probably the best - there some cops who are far-right sympathisers and there are incompetently managed and organized Police forces. Both of those things are already demonstrably true and explain how the response quite well without introducing a grand conspiracy.
However, it is no secret that the FBI has long-reported (2006!) on white-supremecist infiltration of police forces[1] - this is not crazy talk. If someone joined the police as a rookie in 2006 to enforce their personal agenda, how far up the leadership hierarchy would they be now?
1. https://www.pbs.org/newshour/nation/fbi-white-supremacists-i...
This picture?
https://commons.m.wikimedia.org/wiki/File:Pence_posing_with_...
A police department with an intelligence unit couldn't guess that things might get a little out of hand when 3 weeks before, the President publicly used Twitter to ask his followers[1] to attend a "wild" protest on January 6th? Not that an intelligence unit was required as the plans were in the open. I have great difficulty in putting this down to incompetence, all things considered.
1. https://twitter.com/realDonaldTrump/status/13401857732205158...