Bignuf, did this happen to you?
I know some people did this during the "upheaval" to cause trouble both for the individual they flagged, but also to pester admin.
The policy here is that people WILL be banned for doing this and wasting the admin's time. They might warn someone, but they don't have to before banning.
(Also, when someone flags something, there is no need for anyone else to flag it as well because the message is sent directly to the big shots.)