Encouragement rocks..great story and so true. There are people who get paid to come up with silly, lame, ideas and make it a thing. I am too logical to appreciate things that are not really useful tools. A rock? Seriously insulting to those health care workers.
Reminded me of a very long time ago Boy Scout camping trip in NW Montana. Among other activities, somebody came up with what was called a Biodegradable Frisbee Tossing contest.
That was supposed to be where our 11-to-13 year olds would pick up a buffalo chip (that's a dried-out pile of bison poop for you flatlanders) and throw it like a frisbee.
Passing out those rocks is only a half-step up from buffalo chips, but doesn't bother to mitigate the deal by being tongue-in-cheek.
Insult's too mild a word.
They probably used to be some people's pets.

::I am too logical to appreciate things that are not really useful tools. A rock?::
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Now, don’t be too hasty. I can think of a few great uses for those rocks....