yeah,
BLM march in Washington - Capitol steps
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MAGAs storm Capitol steps were empty and we end up with this
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IIUC the difference between the 2 is for the left-protests, the perimeter was established at the steps of the capitol itself. For the right-protests, the perimeter was established on the boundary of the Capitol grounds. (From recorded audio, it's one of the complaints of the MAGA protestors....they were "being kept from the people's house"). They only, however, put up a chain link fence around the Capitol grounds...presumably because they are putting up the inauguration scaffolding and need to maintain access. Traditionally, groups have been allowed to protest on the Capitol grounds and steps....but because of COVID has been restricted (as I've written....none of this happens except from COVID).
Ultimately, BTW, the Speaker of the House is responsible for Capitol security, so if you generally buy into the "buck stop here" argument that's where responsibility for the debacle on the security end of things lie.