I think it’s a matter of the offensive vs defensive narrative of the protest that determine the efficacy of the violent vs non violent imagery — the Jan 6 was a movement of grievance against deep state bureaucratic elites by the undeservingly downtrodden MAGA - here the protesters are the victims offensively taking back power and the violence is justified in the eyes of their supporters with similar resentments. In the anti-ICE narrative, the protesters are defending against the ICE aggressors and thus a nonviolent and defensive posture is more aligned with those who would be sympathetic to this cause.