That is so inconsiderate, that I lack words... (and I just have to ask: you have inmates to clean your workplace? As in people who are in prison?) And then get some person, who had nothing to do with it, but is the only one with a conscience to go in and take the rant. Mind-boggling..
I get the same feeling as you sometimes that I get upset by really minor things, when other people live each day in fear of their lives and unable to do anything about it - but luckily mine and your society is a safe environment which should allow for people to pull out their conscience and exercise respect for one another. Really!
(And I apparently I didn't lack for words after all. ;) )