This approach risks backfiring in multiple ways.
In the event that a moderator flags a post as being a suspected hack, the contributor may view this as a dismissal of their input. They may further cause them to react negatively, who may genuinely feel that harsh language is necessary for the given topic at hand.
A scenario, wherein harsh—but sincere—posts are met with this intervention from a community moderator, is foreseeable. Such a scenario would undermine this intervention's continued use in that case.
Should this intervention be available for use, moderators should exercise immense care before leveraging it, and only use it in a highly targeted way.
Of course, as this intervention remains untested, such a backfiring effect also remains strictly conjecture.