I went and looked at yesterday's hidden comments.
nanobot provided quite a few and has zero mojo bars but is still with us.
citizenk has five bars of mojo and survived one HR'd comment quite nicely.
HopeNope is no longer with us. HopeNope's final diary included pictures of dead children, compared HopeNope to Patton who forced the Germans to tour Dachau, and called President Obama a war criminal. It seems that was enough to trigger banning.
Uberbah got significant HR action for two comments in two different diaries, but is still a four-bar mojo Kossack. Both of Uberbah's comments also received significant uprating. These comments appear to be part of personality-driven battles rather than anything relating to more and better Democrats, fewer and worse Republicans, or even pooties.
volfied posted one comment which was HR'd. volfied still has 3 mojo bars.
Those were the only four users who got HR'd yesterday. Evidently there is some mechanism for banning, but it may not be a result of being HR'd, as it appears that nanobot has gotten all the negative attention a Kossack could want but is still with us.
This diary is not intended as criticism of anyone mentioned, except perhaps HopeNope who posted a truly egregious diary. Since there is a lot of attention being paid to pie wars and new mojo rules, I thought this might interest people.