I wouldn't know how to distinguish all of these calls for protest lately from astroturfing campaigns.
Are there really no institutions left in the US you can rally behind and who are big and experienced enough to call for organised protests? What are the biggest non-governmental progressive or liberal institutions in the US anyway?
You can absolutely want peace and even agree to concessions to Russia to reach a sustainable peace, but this point is absolutely valid: there must be security guarantees, otherwise Putin will just use the armistice to rebuild its strength and attack again.