A study by Yale University in 2016 show that BJP saw a 0.8 percentage point increase in their vote share after a riot in the year prior to an election
Analysing the effect of riots on the vote share of “Hindu nationalist parties”, the paper notes that “the BJS/BJP saw a 0.8 percentage point increase in their vote share following a riot in the year prior to an election”. “The polarization of the electorate induced by riots disadvantages Congress in subsequent elections, making it counter-productive for the party’s affiliates to instigate riots following an electoral loss,” the paper notes.
However, we conclude that this claim is unverifiable because we cannot judge a claim based on one study. Additional studies and further research is needed.