it's "don't let yourself be radicalized" until you tell them to not support terrorist organisation or wish death onto people they see as evil.
if you think death threats are good when the person "deserves it", you're radicalized.
if you think supporting an organisation that have committed multiple crimes and is known for being terrorists, you're radicalized.
if you dehumanize the other side and believe they're evil/bloodthirsty/animals/brainwashed, you're radicalized.
if you think blind violence against regular people and small businesses is good when it's for the "right" cause, you're radicalized.
if you think children and minors are monsters for being born into a world that taught them to support the opposite side, you're radicalized.
even the most vile person on the planet is still human, if a movement tells you some people are less human because of their race, religion, gender, sexuality, or political beliefs:
rip dean winchester, you would’ve heard owen from i saw the tv glow say “when i think about that stuff, it feels like someone took a shovel to my insides and there’s nothing in there” (referring to if he likes boys or girls) and had to leave the room immediately