As we saw in a link how Big Brother dealt with physical and mental abuse by immediately evicting the antagonist.
Would shukla, sana, Salman be at this point in the show if Bigg Boss did his job and evicted shukla the first time he expressed violence. It would have put the rest of the housemates on alert seeing this example. They would think twice to commit violence or abuse of any type if they saw how well the makers adhered to rules.