They let them in because they were severely outnumbered. What else were they going to do? Bare in mind, that wasn't the only part of the perimeter they breached.
Police know how to hold the line when ordered to do so. They had two weeks to prepare.
I guess two weeks wasn't enough.
It is far easier to defend a building than to clean it. They had no problems cleaning it. They let them in because of the optics, they knew they could clean it whenever they wanted.
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