With the much reduced travel traffic outside, it stands to reason law enforcement is having a much easier time running everyone's plates to look for stolen vehicles, outstanding warrants, etc. Cleaning up what is left of the street-thug level gang members during this time?
They had those populations already quarantined – makes zero sense to let them out "for their safety" just saying. Which means you are probably correct.
Thinking it through, I guess that doesn't apply in most jails, which have in-and-out traffic all the time. Still don't like it.