When they are tagged, More noob accounts will post crap to rank up and join again, This will worsen the situation.
I believe that if you let them do what they want, as already shown, that the infestation will be much greater.
The hope is with a threat of ruined accounts people will behave better...
Or that shitcampaigns will start accepting people with negative trust, thus making the work useless.
I have no problem tagging projects who employ corrupt managers / do not employ managers / accept managers or users with negative ratings.