Would you expect the deputies to remove their firearms just before arriving? Should they have arrived on bicycle instead of by cop car? Perhaps the ridiculous sound of the story is from the sensationalist writing.
Refer to the legal principle of proportionality.
The law requires some minimal amount of adult supervision in childcare settings that was already violated when none of the supervisors were being interrogated. Sending one person to remove one child supervisor would have exacerbated that problem.
And yes, I understand that Colorado is in the United States and that the United States has a very bizarre idea of what it means to protect citizens (or to protect children).