Why go the Mob?

On my work trips occasionally having casual talks with the factory people, now I know one reason why they go for mobs. The factory workers claimed if the prime minister was overthrown (he did), their participation in the mob was a success and they felt proud that they had did something for the country. Else, being just another local folk, what can they do to contribute to society? They were not paid they claimed. They just wanted to do something which resulted in something that’s all.