Earlier quoted context omitted.
In the Netherlands there are a few entry ways and they look a bit like this: https://www.dormakaba.com/resource/blob/128222/7d74af646dce4... They're configured one-way only, can be fully opened for high through-put or emergencies, but are otherwise single-person only. They can detect multiple people in various ways. The default for sensitive areas would be biometric (e.g. weight, some parlement members coming back fr…
The US Capitol belongs to the people. There are risks from that which fall on the people who serve there. In counties with monarchs there are different traditions expressed by the architecture of public institutions and the seats of power.
It makes no sense at all that the US Capitol doesn't have stronger barriers between the public areas and the private offices. Every bank or other large company has such a setup for information security reasons.