The point of the article if you follow the hyperlinks to the original WaPo one is that it were the leaders of the House and Senate who refused to increase security. I wasn't denying that it were Trump people that marched on the Capitol.
there are contradicting reports, they seem to be blaming each other. Here's what we know.
Capitol Police appears to be main culprit. They were well understaffed. The head has resigned. Capitol Police is controlled by Congress, but regardless of who they are controlled by, many police are sympathetic with Trump. The capitol police who was killed WAS A TRUMP SUPPORTER. Many of the Capitol police were helping the MAGA rioters, and even showing them were certain rooms and offices were.
The National Guard WAS handicapped by Trump, they were not allowed the sufficient equipment or arms and ordered to be nowhere near the Capitol, and after they were called, it took them 4 hours to respond. The national Guard is controlled by the DOD, who Trump overhauled just weeks ago to put in loyalists.
its not quite clear what was going on with Capitol Police or who was responsible for what but definately something fishy was going on with them.
In regards to the National Guard, that one is definately on Trump. So no matter how you spin this, Trump was at least partially involved with the lack of protection, equipment, and response time. there is no way of getting around that.
and no matter who was ultimately responsible for lack of security
MAGA was responsible for breaking in and rioting and looting. You cannot blame that on anybody else. These people were unhinged, 4 years of pro-Trump propaganda does that to you.