Violence-free family ties, non-violent peers or attachment to society have been pointed out as protective factors against different types of extremism and violent radicalization by international literature. However, more detail needs to be provided about which specific aspects within these realms (friendship/family/community) are effective in challenging violence and how they operate in practice. Recent research conducted under the framework of the PROTON project (Horizon 2020) has analyzed the social and ethical impacts of counter-terrorism and organized crime policies in six European countries. In this article we discuss some identified common features among practices that, developed by organized actors operating at the local level (e.g.: grassroots-based associations, educational institutions, other type of organized networks for prevention, NGOs), are contributing to preventing youth violent radicalization, a phenomenon of growing concern in Europe and beyond. Standing on a solid rejection to violence, these shared features are the following: a bottom-up approach in setting allies with key stakeholders from the community or/and family members to intervene; the promotion of trustworthy and healthy friendship relationships; debunking the lure surrounding violent subjects ("false heroes") and violence in the different contexts, especially in the socioeducational one.