Mob comprises off you , me and may more like us . But individual behaviour and mob behaviour are so different from each other . When people get togather to opine about something or stage some protest against something it certainly have more impact than individual protest or opinion .
Aso when some fellow human being are in disaster people gather to help and empathise them , which act as great moral support to sufferer . But sometimes such gathering causes hindrance in rescue specially when the mob can do nothing to stop the mishap .