There is the right to freedom of speech but not hate speech. Hate speech can easily lead to violence and must be condemned and denounced.
Most of these rallies end up supporting and praising the killing of Jews. They create an unsafe environment for Jews everywhere.
As an example, on the morning of October 7, the world learned of the brutal atrocities committed by Hamas militants against Israeli civilians, including the butchering of women and children, rape, and people being burned alive. Before Israel staged any sort of military response against Gaza, pro-Hamas protests were held across the world, celebrating the murder of Jews. This is hate speech, this is encouraging terrorism, and this is not denouncing Israeli reprisals.