I think that often it would be better to deal with the offending/offensive party (in this case the one throwing out attacks) and leave a thread open, rather than shut it down entirely.I have to admit while reading the last page of posts on the original thread, that I felt as if it was about to descend into chaos - even if it wasn't the intention.
The sudden lock brought that possibility to a sudden halt, before it could even get started.
Regardless, maybe like @bagheera369 said there should be some clarity in what certain usergroups can/cannot do and the intention of the role.
And feel better @Mitsurugi-w . Nothing sucks as much as throwing up.