STUDIES:
671/
“White respondents were more likely to approve of police striking citizens in some situation, who are vulgar, attempting to escape, [or] attacking the police. White respondents were less likely to approve of police striking murder suspects compared to African American[s]."

Race and Police Use of Force: A Regression Analysis of Varying Situational Approval from 1972 to 2012
Applied Psychology in Criminal Justice
Vol. 13 Issue 2, pp. 142–154,
2017
Comment on this study on its Twitter thread.