I think ‘impose’ is a strong word and there is nothing wrong with people trying to persuade others to their point of view.Trying to impose a different set of cultural norms , speakers corner is full of extremists. Treatment of women LGBTQ , trying to impose blasphemy laws. If I went to Dubai or Saudi Arabia I would follow their rules as I don't believe I could be happy following them I choose not to go.
Also, it’s called speakers corner for a reason. The clue’s in the name