That would be why I included those qualifiers.
'From the perspective of moral absolutism and the existence of unambiguous evil, which seem to be the perspectives of at least a few groups and powerful entities within the system'
In-character, in-setting, it is entirely reasonable, all else being equal, for an individual to come to the conclusion that the wholesale destruction of a group such as the Black Court would be a Good act. In-character, in-setting, other individuals may very well disagree.
Out-of-character, out-of-setting, the perspectives of the various players are not actually all that relevant except insofar as they influence what sorts of issues those individuals are comfortable with exploring, and to what degree.