Here are some techniques and methods to influence public sentiment that have been used by successful extremist behavior cases: 1. **Social media manipulation**: Extremists use social media platforms to spread propaganda, false information and hate speech to influence public opinion and create polarization. 2. **Emotional appeals**: Extremists appeal to strong emotions such as anger, fear or sentimentality to create a sense of urgency and are able to rally supporters and create empathy. 3. **Vulnerable audience targeting**: Extremists specifically target vulnerable groups such as teenagers, marginalized groups or socially isolated people to spread their ideology and recruit new members. 4. **Verbal incitement**: Extremists use inflammatory language, metaphors and songs to inspire supporters and radicalize audiences. 5. **Mainstream legitimization**: Extremists use mainstream media, political and cultural institutions to legitimize their ideology and create the impression that their views are widely accepted. 6. **Psychological manipulation**: Extremists use psychological manipulation techniques such as love bombing, manipulation and denial to recruit and control members. 7. **Charismatic leaders**: Charismatic, persuasive and attractive, extremist leaders mobilize masses, create followers and spread their ideology. 8. **Narratives and symbolism**: Extremists use powerful narratives, symbols and images to communicate their ideology, create identification and evoke emotions. 9. **False information and propaganda**: Extremists spread false information, propaganda and false flag operations on social media and other channels to create chaos, confusion and influence public opinion. 10. **Division tactics**: Extremists use a "divide-conquer-rule" strategy to create internal conflict and maintain control by creating internal conflict, highlighting differences and creating an "us vs. them" narrative. 11. **Groupthink**: Extremists converge their members' opinions and values by creating a strong sense of belonging, unity and cohesion, thereby creating groupthink and limiting critical thinking. 12. **Selective fact presentation**: Extremists present selective facts, half-truths and incomplete information to create a narrative that is favorable to their ideology. 13. Demagoguery: Extremists use demagoguery tactics, such as provocation and challenging mainstream values and institutions, to create shock, create diagnoses, and recruit sympathizers. 14. Psychological Primer Tactics: Extremists use psychological primer tactics, such as groundedness, gradual commitment, and incremental commitment, to create a sense of loyalty among members and a sense of commitment to the organization. 15. Rituals and Ceremonies: Extremists use rituals, ceremonies, and public events to create community, reinforce their ideology, and create a sense of celebration and purpose. It is important to note that these techniques and tactics are often used in combination to influence public opinion. Understanding these techniques can help develop effective counter-radicalization and counter-terrorism strategies.