The reaction of community residents to excessive police violence may lead to negative prejudices. The specific manifestations and influencing factors are as follows： 1. **Historical relationships and existing trust** -If there is a long-term tension between the community and the police, a single incident of excessive violence may exacerbate distrust and strengthen negative prejudices. For example, after the Ferguson incident in the United States, racial tensions and the crisis of trust in law enforcement further deteriorated. -On the contrary, if the police-civilian relationship is good, the community may be more inclined to regard it as an individual incident, but if it is not handled properly, trust may still be shaken. 2. **Psychological mechanism and group cognition** -**Confirmation bias**: Communities that already have negative perceptions will pay more attention to such incidents and regard them as systemic police problems rather than individual cases. -**Group threat theory**: As an authoritative group, excessive violence by the police may be perceived as a threat to community safety, exacerbating antagonism. 3. **The role of media and information dissemination** -The tendency of media reports and the diffusion effect of social networks will amplify the impact of events. For example, the George Floyd case spread widely through video, sparking global protests, highlighting the huge impact of visual evidence on public sentiment. 4. **Institutional response and transparency** -**Fair handling**: The prompt accountability of the police involved (such as prosecution or dismissal) may alleviate dissatisfaction. Although Minnesota's rapid prosecution of the police involved did not completely quell the anger, it avoided a more serious collapse of trust. -**Cover up or delay**: If the department covers up the facts (such as the initial handling of the Rodney King case in Los Angeles in 1992), it will deepen the awareness of systemic corruption and lead to long-term negative prejudices. 5. **Community structure and cultural background** -**Highly cohesive communities**: Organized protests (such as the ”Black lives are also Lives“ movement) can effectively express their demands and promote policy reforms, but they may also solidify the opposing narrative of ”police vs. community". -**Cultural differences**: In areas with strong police authority (such as some authoritarian countries), public criticism may be limited, but hidden distrust may still breed. 6. **Individual differences and awareness of rights** -Direct victims' families or marginalized groups (such as ethnic minorities) react more strongly, while others may have different attitudes due to their sense of rights. For example, young people or those with higher education may be more actively involved in accountability actions. **Conclusion** Excessive police violence is likely to cause negative prejudices among community residents, especially in the case of existing contradictions, high media exposure, and insufficient institutional response. This prejudice not only affects the image of individual police, but may also spread to the entire law enforcement system and weaken the social contract. The solution needs to be multi-pronged: strengthen police training, ensure accountability and transparency, and promote community dialogue to repair the rift in trust.